Mastery is off the Kentucky Derby trail after being diagnosed with a condylar fracture in his left front ankle following his victory on Saturday in the San Felipe Stakes at Santa Anita.
He was pulled up after the race after jockey Mike Smith felt he was off in his left hind. But after getting back to the barn, Mastery showed signs of discomfort in his left front and was X-rayed, which revealed the fracture.
Trainer Bob Baffert said he would likely have surgery on Monday.
"What a game. We went from the highest highs," Baffert said at his barn. "What an amazing performance."
More later at www.drf.com