For you track guys, I put together a list of the 10 fastest 100m white guys over the past 10 years (since 2003).
It's interesting to see that they are from all different countries - except Italy has 2 guys making the list.
Lemaitre, Gemili, Guliyev, and Reus are the only ones on this list that have enough youth on their side to possibly improve.
I think Gemili has the best chance for improvement.
Guliyev does not seem fully committed to the sport, and has not competed much lately.
Reus is a question mark to me. He hasn't had any other fast times.
Lemaitre is obviously the best of all, but may be trending downward. We'll have to wait and see.
Perhaps someone like Michael Tumi from Italy can be added to this list later this year.
1/ 9.92 Christophe Lemaitre - France
2/ 10.05 Adam Gemili - GB
3/ 10.06 Simone Collio - Italy
4/ 10.08 Ramil Guliyev - Azerbijan
5/ 10.09 Christie Van Wyk - Namibia
5/ 10.09 Matt Shirvington - Australia
5/ 10.09 Julian Reus - Germany
8/ 10.13 Fabio Cerutti - Italy
8/ 10.13 Morne Nagel - South Africa
8/ 10.13 Nick Macrozonaris - Canada
8/ 10.13 Matic Osovnikar - Slovenia
For comparison's sake, here's the East Asian (Oriental) top 10 over the same period - Japan dominates this list:
1/ 10.03 Shingu Suetsugu - Japan
2/ 10.07 Masashi Eriguchi - Japan
3/ 10.07 Ryota Yamagata - Japan
4/ 10.09 Nobuharu Asahara - Japan
4/ 10.09 Naoki Tsukahara - Japan
6/ 10.16 Bingtian Su - China
7/ 10.17 Haijian Chen - China
8/ 10.19 Yoshihide Kiryu - Japan
9/ 10.20 Shinji Takahira - Japan
10/ 10.21 Yi Lao - China
10/ 10.21 Peimeng Zhang - China
10/ 10.21 Shintaro Kimura - Japan
10/ 10.21 Hiroyasu Tsuchie - Japan
10/ 10.21 Yusuke Kotani - Japan