The trainer has until 5:05 PM Pacific Time today to pull the mare from the race, but "[d]espite concerns over a 'separation' issue with Del Mar's Polytrack ... the undefeated mare Zenyatta would run in the Clement L. Hirsch Stakes."
The report said:
Three horses have been euthanized in the first 13 days of the meet as a result of injuries on the Polytrack. Two came as a result of racing and a third, Friday morning, came as a result of a training accident. A fourth horse had to be euthanized due to an injury on the turf course.The trainer discussed the "clumpy" track with a track executive who assured him it would be fixed."