Jake Johnson (who has sat out half the season, but is now standing in for Brad Baker in the factory Harley team).
The rider who I think could have pushed Wiles the hardest, Brad Baker, broke his leg hitting some debris (that was rumoured by be from a dirt track racecar, but I haven't heard for sure) at the recent Black Hills GNC round in Sturgis.
Jared Mees will be up for a fight, but will be happy with a podium to keep his title defence on track.
This is likely to be the last Peoria TT National the Experts will ride 450s at because of somewhat controversial proposed changes to the AMA GNC rules, that will mean Experts ride twins in ALL race, TT or short track.
Today's race is available to watch live on fanschoice.tv
Here are the timings to watch online.
Practice/qualifying: 11:30 a.m. ET (8:30 a.m. PT)
Pre-race show: 1:45 p.m. ET (10:45 a.m. PT)
Opening ceremonies: 2:30 p.m. ET (11:30 a.m. PT)
Heat races: 3 p.m. ET (noon PT)
GNC2 main: 5 p.m. ET (2 p.m. PT)
GNC1 main: 5:30 p.m. ET (2:30 p.m. PT)
These photos, from Peoria 2014, courtesy of AMA Pro Racing. G