The culprit

[Clockerbob]

http://www3.signonsandiego.com/stories/ ... dex=140826

We've looked at the track every single way we can with every expert we've got, including horsemen, and they all say the track is fine,” Harper said.
“The track is in the best shape it has ever been, it's fair, we've had close, exciting races.
“We know the first week is when a track is most vulnerable. The culprit, if there is any, may be the change in surfaces (from Hollywood Park or other tracks to here). Not a change from good to bad or bad to good or anything like that, just different to different.”