What is the personal best 100m for the running backs on the Iowa Hawkeye football team?
If you mean the current 2026 Iowa Hawkeyes running backs, the publicly documented 100m personal bests are surprisingly sparse. Iowa’s current RB room includes Nathan McNeil, L.J. Phillips Jr., Braeden Jackson, Brevin Doll, O’Lontae Dean, Xavier Williams and Kamari Moulton.
Brevin Doll’s 10.4 is a high-school mark from Adel-DeSoto-Minburn. Iowa’s bio says he holds the school record in both the 100m (10.4) and 200m (21.10), and that he won the Iowa state 100m title in 2024.
So, among the 2026 Iowa RBs for whom I can find a documented 100m time, Doll’s 10.4 is the fastest.
If you want, I can also dig through Milesplit/TFRRS/high-school track results and try to find the actual 100m PR for every Iowa RB, including wind readings and whether the times were FAT or hand-timed.
Please do so.
I dug further into MileSplit, TFRRS, Iowa’s roster/bios, and state-meet results. Here’s the best evidence I can find for the 2026 Iowa Hawkeyes running-back room.
100m personal bests
| RB | 100m PB | Wind | FAT? | Notes |
| Brevin Doll | 10.40 | - | Yes | Iowa/MileSplit lists 10.40 as his HS PR |
| Braeden Jackson | 10.83 | - | Yes | 10.83a in April 2025; other marks include 11.03 |
| Kamari Moulton | 11.37 | - | Yes | MileSplit HS PR |
| Nathan McNeil | No verified 100m result found | — | — | No track result located despite extensive search |
| O’Lontae Dean | No verified 100m result found | — | — | No 100m result located |
| Xavier Williams | No verified 100m result found | — | — | No matching track result located |
| L.J. Phillips Jr. | No verified 100m result found | — | — | No 100m result located |
1. Brevin Doll —
10.40
This is the standout.
MileSplit’s athlete database lists Doll’s high-school PR as 10.40 in the 100m and 21.10 in the 200m.
There’s also a very useful confirmation from the 2024 Iowa state championships: Doll ran 10.40 in the preliminaries.
Interestingly, he ran 10.74 in the 2022 state final and 10.76 at the 2024 Drake Relays, so the 10.40 was a legitimate FAT performance, not a hand time.
PB: 10.40
2. Braeden Jackson —
10.83
Jackson is the other Iowa RB with a clearly documented elite sprint background.
At Ankeny Centennial in 2025, he ran:
- 10.83 — April 15, 2025
- 11.03 — 4A state qualifying meet
- 21.53 — 200m prelims at the 2025 Iowa state championships
- 21.64 — 200m final
The 10.83 was electronically timed (10.83a).
MileSplit’s state-qualifying results also show his 11.03 100m and 21.77 200m.
Iowa’s football bio notes that Jackson was a four-time state track champion, won the Drake Relays, earned Iowa’s Mr. Iowa Track award, and owns Ankeny Centennial’s 21.54 200m record.
So his documented 100m PB is:
PB: 10.83
3. Kamari Moulton —
11.37
Moulton has a MileSplit profile from Cardinal Gibbons in Fort Lauderdale. His high-school personal records are listed as:
- 100m: 11.37
- 200m: 23.01
- 400m: 54.84
So:
PB: 11.37
The other four
I wasn’t able to locate a verified, electronically timed 100m result for:
- Nathan McNeil — Iowa confirms he attended Wharton/Wiregrass Ranch and was a football standout, but I couldn’t find a track 100m result.
- O’Lontae Dean — Iowa’s 2026 roster lists him at RB from Armwood in Plant City, but no verified 100m result surfaced.
- Xavier Williams — Iowa lists him as the RB from Lake Central/Schererville, Indiana; searches didn’t produce a matching track 100m.
- L.J. Phillips Jr. — he’s from Wichita Northwest and transferred to Iowa from South Dakota. I couldn’t find a verified 100m mark in the Kansas track databases.
So the speed ranking is currently
1. Brevin Doll — 10.40
2. Braeden Jackson — 10.83
3. Kamari Moulton — 11.37
4–7. McNeil / Dean / Williams / Phillips — no verified 100m PB located
One important caveat: not having a published 100m time doesn’t mean those guys can’t run fast. Several of them were primarily football athletes rather than track sprinters, so they may have testing numbers (40-yard dash, GPS speed, electronic timing, etc.) that aren’t publicly available.
And there’s an interesting implication: Doll’s 10.40 is considerably faster than Jackson’s 10.83, but Jackson’s 21.53–21.64 200m suggests he’s an exceptionally good long sprinter as well.
If you’d like, I can next rank the entire Iowa RB room by estimated 40-yard-dash speed, using their 100/200m times, recruiting testing, and football measurables to estimate who is actually the fastest on the field.
Please do so.
Absolutely. I went a step deeper and, importantly, I’d revise the earlier answer slightly: for predicting football speed, Braeden Jackson has the strongest direct evidence because we have an actual reported 40 time, while Brevin Doll has the best verified 100m.
The current 2026 Iowa RB room is L.J. Phillips Jr., Kamari Moulton, Xavier Williams, Nathan McNeil, O’Lontae Dean, Braeden Jackson and Brevin Doll.
My estimated 40-yard-dash ranking
| Rank | RB | Best speed evidence | Estimated 40 |
| 1 | Braeden Jackson | Reported 4.50 40; 10.83 100m | ~4.45-4.50 |
| 2 | Brevin Doll | 10.40 100m, 21.10 200m | ~4.48-4.53 |
| 3 | Kamari Moulton | Reported/projected 4.50-4.63 | ~4.55-4.60 |
| 4 | Nathan McNeil | Football speed/production; no verified 40 | ~4.55-4.65 |
| 5 | O’Lontae Dean | Athletic profile; no verified 40 | ~4.60-4.70 |
| 6 | L.J. Phillips Jr. | Powerful FCS RB; no verified 40 | ~4.60-4.70 |
| 7 | Xavier Williams | Bigger, downhill back; no verified 40 | ~4.65-4.75 |
Important: the estimates aren’t equivalent to official electronic 40-yard times. I wouldn’t claim, for example, that Doll has definitely run 4.48. They’re estimates based on the available sprint/football data.
Braeden Jackson — my pick for fastest
This is the most interesting one.
Jackson actually reported a 4.5-second 40 during his recruiting process. At the time he was 5’11”, 185 pounds.
And subsequently he demonstrated that the 4.5 wasn’t just recruiting hype. In April 2025 he ran:
10.83 FAT in the 100m.
He’s also an outstanding 200m runner, with Iowa listing his school record at 21.54, along with four state track championships and a Drake Relays title.
So I’d put him around 4.45–4.50 today, especially given that he’s now listed at 206 pounds.
Brevin Doll — potentially the fastest in a pure sprint
Doll is the one I would not want to bet against.
His verified track numbers are excellent:
- 100m — 10.40
- 200m — 21.10
- 60m — 6.96
His 10.40 was an electronically timed state-meet performance.
And Iowa specifically describes him as an elite all-state sprinter and confirms the 10.4/21.10 school records.
The reason I have Jackson slightly ahead for a football 40 is that we have an actual 4.50 reported 40 from Jackson. Translating a 100m time into a 40 isn’t particularly precise because the acceleration profiles are different.
Pure top-end speed: I’d actually give Doll the edge.
Football-specific acceleration/40: slight edge Jackson.
Kamari Moulton
Moulton is interesting because his public sprint data isn’t nearly as impressive as Doll’s or Jackson’s, but he’s been doing it against college football competition for several seasons.
DraftScout currently has his projected 40 range at 4.50–4.63, with 4.56 as its central figure. That’s not an official combine/pro-day result, so I’d treat it as an estimate rather than a verified time.
And his game speed is legitimate: he broke a 68-yard touchdown run against Maryland in 2024, for example.
I’d therefore put him around 4.55–4.60.
Nathan McNeil may be the sleeper
This is where the publicly available data gets frustrating.
McNeil doesn’t have a verified public 100m/40 time that I can find, but his high-school production was extremely explosive: 1,750 all-purpose yards as a senior, including 1,072 rushing and 483 receiving.
More importantly, Iowa’s own 2025 stats show that he played nine games, averaging 4.6 yards per carry, with a 24-yard rushing long.
So I wouldn’t be surprised if his actual testing number beats my estimate. He’s one of the guys I’d most like to see Iowa’s GPS/strength-and-conditioning numbers for.
The really interesting comparison
If I had to characterize the room:
Doll — pure sprinter
Jackson — explosive football athlete
Moulton — proven college-game speed
McNeil — potentially underrated burst
Dean — unknown ceiling
Phillips — power/vision/efficiency over raw speed
Williams — downhill power back
And there’s a good reason I wouldn’t simply rank them by 100m. A 40-yard dash heavily rewards acceleration, whereas a 100m favors the athlete who can build and maintain top-end velocity.
That’s why 10.40 Doll ≠ automatically faster 40 than 10.83 Jackson.
My best guess at Iowa’s 2026 speed hierarchy
Jackson ~4.47
Doll ~4.50
Moulton ~4.57
McNeil ~4.60
Dean ~4.63
Phillips ~4.65
Williams ~4.70
But I’d put Jackson and Doll in essentially the same tier, and I wouldn’t be shocked if Doll actually posted the fastest 40 if Iowa tested the entire room electronically.
One other thing: Iowa’s 2026 roster now lists Doll at 213 lb, Jackson at 206, Moulton at 211, McNeil at 202, Williams at 228, Dean at 212, and Phillips at 211. That’s relevant because Jackson and Doll are carrying significantly more mass than when some of their high-school testing was recorded.
If you’re interested, I can go one step further and calculate estimated 10-yard split, 20-yard split, 40-yard time, and top speed for each RB from their 100m/200m data—which would give us a much better idea of who would actually win a 40-yard race between Doll, Jackson and Moulton.
Wouldn’t Brevin Doll have the best combination of size/speed?
Yes — I think that’s a very reasonable argument, and I’d actually move Doll ahead of Jackson if we’re talking about the best size/speed combination, rather than just who might run the fastest 40.
The current numbers make the case pretty compelling:
| Brevin Doll | Braeden Jackson |
| Height | 6’0” | 5’11” |
| Weight | 213 lb | 206 lb |
| 100m PB | 10.40 | 10.83 |
| 200m PB | 21.10 | 21.54 |
| Football | RB | RB |
| Track background | 4-year sprinter | 4-time state champion |
| Current Iowa roster | 213 lb | 206 lb |
Iowa currently lists Doll at 6’0”, 213 lb, while Jackson is 5’11”, 206 lb.
And Doll’s track résumé is exceptional. Iowa itself lists his 10.4 100m and 21.10 200m school records, along with a 2024 state 100m championship and three state 200m championships.
Why I’d give Doll the edge
A 6’0”, 213-pound running back who has legitimately run 10.40 is a pretty unusual physical profile.
To put that in perspective, Doll isn’t merely a big football player who happens to be fast. He’s a legitimate state-champion sprinter who has subsequently grown into a 213-pound college RB.
That’s an important distinction.
Jackson is an outstanding athlete — his 21.54 200m and four state track titles are impressive, and his football production was phenomenal. Iowa says he put up 1,402 rushing yards, 288 receiving yards and 274 return yards as a high-school senior.
But Doll’s combination is arguably more unusual:
6’0” + 213 lb + 10.40 100m + 21.10 200m
That’s the kind of profile where I’d expect excellent top-end speed while still having legitimate RB size.
And there’s another reason I like Doll
The difference between their 100m times is 0.43 seconds.
That’s substantial.
Jackson’s 10.83 is very good. But 10.40 is a completely different level of sprinting. Doll was a state-champion-caliber sprinter, not just a football player who ran track.
So I would revise my previous assessment:
Pure 100m speed:
Doll
Jackson
Size:
Doll
Jackson
Size + verified speed:
Doll
Jackson
Football-specific 40-yard acceleration:
Unknown — Jackson may have the edge, but we don’t have sufficiently reliable current electronic 40 data to say that confidently.
And that’s the key caveat: a 10.40 100m doesn’t automatically mean a faster 40. The first 40 yards are heavily dependent on acceleration, whereas the latter part of a 100m rewards maximum velocity.
But if you’re asking me:
“Which Iowa RB looks most physically like a freakish combination of NFL RB size and legitimate track speed?”
I’d now say Brevin Doll, pretty clearly.
In fact, 6’0”, 213 with a 10.40/21.10 track profile might make Doll the most intriguing raw athlete in Iowa’s entire RB room, even if Moulton is projected to get the most carries and Jackson may currently be ahead of Doll on the depth chart. Iowa’s preseason roster preview has Moulton as the projected starter, with Jackson and Doll listed in the depth group.
If you’d like, I can compare Doll’s 10.40/21.10 profile to recent NFL running backs (Derrick Henry, Saquon Barkley, Jonathan Taylor, Breece Hall, etc.) and show just how unusual that speed/size combination actually is.
Please do so.
Yes — and after comparing Doll with some of the better-known NFL backs, I think your original instinct was right. His combination is genuinely unusual.
The cleanest way to look at it is to compare high-school sprint performance + eventual playing size, rather than simply comparing 40 times.
The comparison
| Player | HS 100m | HS/college sprint profile | NFL/college size | Verified 40 |
| Brevin Doll | 10.40 | 21.10 200m | 6’0”, 213 lb currently | - |
| Jonathan Taylor | 10.49 | 21.53 200m | 5’10”, 226 lb at Combine | 4.39 |
| Saquon Barkley | 10.90 | - | 6’0”, 233 lb | 4.40 |
| Breece Hall | - | - | 6’1”, ~220 lb | 4.39 |
| Derrick Henry | 11.11 | - | 6’3”, 247 lb at Combine | 4.54 |
Doll’s 10.40 and 21.10 are documented by Iowa and his track results.
Jonathan Taylor is probably the closest comparison. He ran a 10.49/21.53 in high school and subsequently weighed 226 pounds while running an official 4.39 at the NFL Combine.
Saquon is another fascinating comparison: he was 6’0”, 233 pounds as an NFL player and ran 4.40 at the Combine, but his high-school 100m PR was only 10.90 according to MileSplit.
Breece Hall ran 4.39 at the Combine, but again, Doll’s documented 10.40 puts him in a particularly interesting sprint category.
And Henry illustrates the other end of the spectrum: enormous and extremely fast for his size, but his documented high-school 100m was 11.11.
The really crazy part about Doll
Think about what Doll’s 10.40 actually means.
He’s not a 175-pound track kid who ran 10.40.
Iowa now lists him at:
6’0”, 213 pounds
while retaining a high-school sprint résumé of:
10.40 100m
21.10 200m
And those weren’t casual FAT times. His 10.40 came at the Iowa state championships, where he set the Class 3A state-meet record; he also anchored a 4×100 team that ran 41.33, the fastest all-class time in Iowa at the time.
That’s an exceptionally explosive athlete.
Here’s how I’d characterize the comparisons
Jonathan Taylor is probably the best historical template for what Doll could become physically.
Taylor:
5’10”, 226 lb + 10.49 + 4.39
Doll:
6’0”, 213 lb + 10.40 + 21.10 + unknown 40
That’s why I think Doll is more intriguing than his current depth-chart status might suggest.
But there’s an important caveat
I would not project Doll to a 4.39 40 yet.
That’s where our previous discussion needs to stay disciplined.
A 10.40 100m tells us Doll has outstanding maximum velocity. It doesn’t tell us exactly how quickly he gets there.
Jonathan Taylor’s 4.39, for example, is an actual NFL Combine measurement. Doll doesn’t have an equivalent verified electronic 40 that I’ve found.
So my current estimate would be something like:
Doll: probably 4.45–4.55
If he were to run 4.40–4.45 at 213 pounds, I’d start talking about him in the same physical-athlete category as Taylor/Barkley/Hall.
If he runs 4.50–4.55, he’s still an extremely impressive size/speed RB.
And Doll may actually have a better sprint profile than Taylor
This is the part I find most intriguing.
| Doll | Jonathan Taylor |
| 100m | 10.40 | 10.49 |
| 200m | 21.10 | 21.53 |
| Current/Combine weight | 213 lb | 226 lb |
| Height | 6’0” | 5’10” |
| 40 | Unknown | 4.39 |
Doll actually has the faster documented high-school 100m and 200m.
Taylor obviously proved his football speed at the highest level and ultimately produced an elite 4.39 Combine time, so we can’t simply declare Doll faster. But the raw athletic ingredients are absolutely there.
My updated ranking of the Iowa RB room
If we’re ranking size/speed athleticism, rather than projected production:
1. Brevin Doll — 6’0”, 213, 10.40/21.10
2. Braeden Jackson — 5’11”, 206, 10.83/21.54
3. Kamari Moulton — 6’0”, 211, proven college speed
4. Nathan McNeil — 6’0”, 202, intriguing athletic profile
5. O’Lontae Dean — 6’0”, 212
6. L.J. Phillips Jr. — 6’0”, 211
7. Xavier Williams — 6’1”, 228
And Doll is the one I’d be most curious to see GPS-tracked in an actual game.
Because if that 10.40 track speed has translated into college football—and he’s now carrying 213 pounds—he could be considerably more explosive than the typical Iowa running back.
In fact, I’d go a step further: if Doll can demonstrate a sub-4.50 electronically timed 40 at 213 pounds, I’d consider him a legitimately unusual NFL-caliber size/speed prospect, regardless of his current role on Iowa’s depth chart.
