Juan Leyva, Sadler's assistant, commented, "It went extremely well, and we were all thrilled with it." "(The next race) is still up in the air at this time. John will most likely make a decision when he returns the next day to check on the horse and make sure everything is well."

Rock Your World remained unbeaten in his first three appearances, including the Runhappy Santa Anita Derby (G1). After a sluggish start and being jostled, he placed 17th in the Kentucky Derby Presented by Woodford Reserve (G1) before finishing sixth in the Belmont Stakes Presented by NYRA Bets (G1).

Also, Trainer John Shirreffs worked Sunday with Pacific Classic contenders Midcourt and Express Train. 

In the summer feature at Del Mar, he is inclined to run just one horse. Of the 12 works at the distance, Express Train completed six furlongs in 1:12 1/5, while Midcourt finished in 1:14 3/5.

Before the official timing, Turrell captured Express Train, trained by Juan Hernandez, in splits of 24, 36 1/5, 47 3/5, and 59 4/5. He then sent the 4-year-old Union Rags colt galloping out to seven furlongs in 1:26 2/5.

Edwin Maldonado rode Midcourt, a 6-year-old Midnight Lute gelding, to work. A six-month break was broken by the multiple graded stakes winner's allowance victory at Santa Anita Park in June.

Despite liking both pieces, Shirreffs was "leaning" toward only running Express Train, who had won the San Diego Handicap (G2) on July 17 at Del Mar.

Todd Fincher, the horse's trainer, told the Del Mar media over the phone from his Ruidoso, New Mexico base that Joe Peacock's Sheriff Brown should be considered "in" for the Pacific Classic. The choice was made after the 5-year-old Curlin gelding ran four lengths at Del Mar on Friday in 48 4/5.

Fincher added, "He came out of his work well, and it looks like it's a go.

After stumbling at the start of the San Diego, Sheriff Brown, who had shipped in from Texas, finished seventh of eight, defeated by Express Train by 8 3/4 lengths.

Fincher remarked, "That was pretty much a throw-away." He had just arrived and felt uneasy with his surroundings. He is a horse, and horses need to feel at ease in their surroundings. This time, we anticipate a much greater effort.

"I've always wanted to give him a go over a longer distance, perhaps a mile and a quarter. Although there are many unknowns, we're going to try it.

In the Pacific Classic, Edwin Maldonado, riding for San Diego, is calling the shots.

The winner of the Pacific Classic, a Breeders' Cup Challenge contest, will be given a fee-paid spot in the Longines Breeders' Cup Classic (G1) on November 6 at Del Mar.