It's hard to know what else Edward Cheserek has to prove.
The University of Oregon distance star has won 15 NCAA titles in a shining college carer.
Yesterday he fought off a challenge by Washington's Colby Gilbert to win the 5,000 meters in the Husky Classic at the UW's Dempsey Indoor.
Blogger Paul Merca has the eye-witness account.
In the process, Cheserek clocked the world's best time in 2017, and pulled Gilbert to the second-best.
It clearly was a great race. It stamps Cheserek as the odds-on favorite to sweep the 3,000 and 5,000 at the NCAA Indoor Championships for the third time in four years -- assuming he opts again for that double.