According to his agent, Derek Lawson, top California rider Flavien Prat has tested positive for the coronavirus. Because he left California to ride Saturday at Keeneland, Prat was required to take a test Sunday before being allowed to ride at Del Mar. The test results were positive and Prat had to take off all his mounts. "These athletes, they know their bodies," Lawson said. "When I picked him up at the airport, he said, 'I think I have it.'" Lawson said that Prat is feeling fine and will return to...