Arcadia, CA -- (Sports Network) - Reigning Horse of the Year Curlin will get serious at Santa Anita Park this Monday, when he works five furlongs over Santa Anita's Pro-Ride synthetic main track between races. The work, which will be performed in company with another Steve Asmussen trainee, has been scheduled between races four and five (approx. 2:45 p.m. pt) and it is expected that if all goes well with the work, he will be pre-entered on Tuesday for a defense of his $5 million Breeders' Cup Classic title and a showdown with Big Brown at Oak Tree at Santa Anita on Oct. 25.

"Our biggest concern with Curlin is the difference in the way the track plays between morning and afternoon," said assistant trainer Scott Blasi. "This is going to be a smooth 5/8 (of a mile) in company. We'll come on the track up in the quarter-mile chute and just jog-off from there and break-off at the 5/8- pole. He'll be working with another horse of ours named Hawaii Calls."

Curlin arrived at Santa Anita the day after winning the Grade I, 1 -miles Jockey Club Gold Cup at Belmont Park on Sept. 27, and he had his first workout since the race this past Monday, breezing a half mile in :52.80.

"His serious work here at Santa Anita will be on Monday," said Blasi. "It'll be a normal 5/8 work. We're not looking for anything real fast, but it'll be done the way we do things in company."

Beyond Monday's drill, Blasi said, "Everything else with his training will be routine. That's what we're looking for right now."

Should Curlin start in the Classic on Oct. 25, a much-anticipated showdown for 2008 Horse of the Year honors would be finalized with this year's Kentucky Derby and Preakness Stakes winner Big Brown.

As was the case this past Monday, Asmussen is expected to fly in from his Texas base to oversee Curlin's work. Among those scheduled to work Monday morning for Asmussen in addition to Curlin are 2007 Breeders' Cup Juvenile runner-up Pyro and multiple Grade I winner Student Council.

Undefeated Casino Drive has been entered to run at Santa Anita on Sunday in what his connections hope will lead to a start in the $5-million Breeders' Cup Classic on Oct. 25.

Casino Drive drew post position two in an optional claiming race at 1 1/16 miles going as the eighth on a nine-race program.

A three-year-old son of 2003 Horse of the Year Mineshaft, Casino Drive breezed five-furlongs Thursday on Hollywood Park's Cushion Track in 1:02.

"We're very happy with it," said Nobutaka Tada, racing manager for Casino Drive's owner, Hidetoshi Yamamoto. "I spoke with Mr. Yamamoto in Japan, and we decided to enter the allowance race on Sunday."

Casino Drive, a half-brother to Belmont Stakes winners Rags to Riches and Jazil, has not raced since winning the Peter Pan Stakes at Belmont Park on May 10. A stone bruise in his left hind foot forced him to miss the Belmont Stakes and has sidelined him since. Casino Drive subsequently was returned to Japan and arrived at Hollywood Park last month.

Casino Drive won his first start in Japan on Feb. 23 this year, scoring by 11 1/2 lengths in a nine-furlong race. In his only other career start, the Peter Pan, he scored by nearly six lengths.

Garrett Gomez, well on his way to winning his third consecutive national money-winning title with more than $17.4 million in the till to date, will ride Go Between in the $5-million Breeders' Cup Classic at Santa Anita on Oct. 25, trainer Bill Mott said Wednesday morning.

The 36-year-old jockey had ridden Classic contender Colonel John in his last two races, including a dramatic nose victory in the Travers Stakes on Aug. 23, and also has ridden Go Between in nine of the horse's 26 career starts, the last five in a row, including a neck victory in the Pacific Classic on Aug. 24.

"We won three $1-million races on Go Between," explained Gomez's agent, Ron Anderson, referring to this year's Pacific Classic and Sunshine Millions Classic and the 2006 Virginia Derby. "Plus, he's won on synthetic."

Go Between, a five-year-old Point Given horse owned by Peter Vegso, has an 8-7-6 record from 26 starts, with earnings of $2,783,880. Colonel John, a three-year-old son of Tiznow owned by the WinStar Farm, won the Grade I Santa Anita Derby last April 5. He has a 5-2-1 record from nine starts with earnings of $1,468,830.

Mott said Go Between would ship for the Classic on Wednesday, Oct. 22.

Colonel John worked four furlongs Wednesday on Santa Anita's Pro-Ride main track in a bullet :46.80, breezing, while Well Armed went three-furlongs in :35.20, breezing, under regular rider Aaron Gryder. Eoin Harty, trainer of both horses, said "there was nothing set in stone yet" when asked who would replace Gomez on Colonel John, adding he was "inundated" with calls from agents seeking the mount for their rider.

The Breeders Cup announced Friday that post positions for all 14 races of the 25th Breeders' Cup World Championships will be drawn on Tuesday, October 21 at Santa Anita Park, following the closing of entries at 10 a.m. (pt).

The Breeders' Cup, Thoroughbred racing's most prestigious global event, consisting of 14 races and $25.5 million in purses, will be run on Friday, October 24 and Saturday, Oct. 25 at Santa Anita, and will be televised live on ABC, ESPN and to more than 130 countries.

The Post Position Draw will be conducted in two sections at Santa Anita. Ten Breeders' Cup races will be drawn beginning at 11:15 a.m. (pt) in Baldwin Terrace, located on the second floor of the west grandstand: $1 million Sentient Flight Group Breeders' Cup Filly and Mare Sprint; $1 million Grey Goose Breeders' Cup Juvenile Fillies Turf; $2 million Bessemer Trust Breeders' Cup Juvenile Fillies; $500,000 Breeders Cup Marathon, $1 million Sentient Flight Group Breeders' Cup Juvenile Turf; $1 million TVG Breeders' Cup Dirt Mile; $1 million Breeders' Cup Turf Sprint, $2 million Bessemer Trust Breeders' Cup Juvenile; $2 million Breeders' Cup Mile and the $2 million Sentient Flight Group Breeders' Cup Sprint.

At 1 p.m., in FrontRunner restaurant, the Emirates Airline Filly and Mare Turf, Ladies' Classic, Emirates Airline Breeders' Cup Turf and the Breeders' Cup Classic will be drawn.

TVG will televise live the draw for the Filly and Mare Turf, the Ladies' Classic, the Turf and the Classic.