From DRF:
Less than 24 hours before he would need to be pre-entered in the Breeders' Cup Classic, Curlin worked between races on Monday at Santa Anita, his move taking on even more interest from wider circles with Big Brown having been retired Monday.
The $5 million Classic on Oct. 25 was anticipated as a matchup between the two most prominent horses in racing in 2008, Big Brown and Curlin. Big Brown's connections had committed to the race, but those entrusted with the care of Curlin have been circumspect about his participation because of uncertainty over how Curlin will handle Santa Anita's Pro-Ride surface. Curlin has never raced on a synthetic surface.
Curlin's work on Monday - five furlongs in 59.11 seconds in company with Hawaii Calls, a stablemate from the barn of trainer Steve Asmussen - was designed to most approximate the conditions Curlin would face in the Classic, should he run. It was a sunny afternoon, with a high temperature in the upper 70s, and a holiday crowd was on hand for the races. Asmussen and owner Jess Jackson had until Tuesday at noon Pacific to decide whether to pre-enter Curlin in the Classic, but after the work Monday they seemed to be leaning toward running.
"I'm extremely pleased with everything Curlin said to us - how he worked, and galloped out," Asmussen said. "I'm very anxious to see how he is in the morning. I want to see the same things. To this point, I'm extremely pleased."
http://drf.com/news/article/99039.html