Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Duchossois, named for Arlington International Racecourse's owner Richard Duchossois, wins the third race on Million Day. (Penelope P. Miller/America's Best Racing)
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Fan favorite and 2015 Arlington Million winner The Pizza Man at Arlington, where he is a stable pony for trainer Roger Brueggemann. (Penelope P. Miller/America's Best Racing)
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Trainer Joseph O'Brien talks to NBC's Nick Luck at Arlington. (Penelope P. Miller/America's Best Racing)
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing
Penelope P. Miller/America's Best Racing