Del Mar canceled training on its main track the morning of July 22, when it was determined that there had been some separation of its Polytrack materials in the stretch area that caused some inconsistencies in the surface makeup.

The Southern California racetrack, which began its summer meet July 21, expected a full racing card at its usual 2 p.m. PDT start despite the problems.

A handful of horses had galloped or exercised on the track following its usual opening at 4:30 a.m. When the apparent inconsistencies were noted to track officials–and following consultations with the track's outriders and track superintendent Richard Tedesco–the decision was made to close the track and immediately perform additional procedures planned for July 26, rather than attempt to quickly reopen it for further training. No injuries to any horses were reported.

"We are taking a cautious path here and leaning strongly on the side of safety," said track president and general manager Craig Fravel