The drunken rider has been named by local media as 24-year-old Michael Wells-Rody.
Ballydoyle trainer O'Brien has trained 124 Breeders' Cup starters, with 12 wins.
California-based Accelerate was installed as the early 5-2 favorite despite drawing the far outside No. 14 post.
Catapult looked poised to win down the stretch, a victory that would have ended trainer John Sadler's streak of 43 straight Breeders' Cup losses, but it was not to be as Expert Eye charged past the wire first on a sunny day in Kentucky. Second in last year's Distaff at Del Mar, Abel Tasman has eight wins and four seconds in 15 career starts and was last year's Eclipse Award victor as top 3-year-old filly. He noted his own bias, though. Often featuring U.S. Horse of the Year candidates and notoriously more hard to predict, the event began on Friday from Louisville with the first of 14 races. After his maiden win at Del Mar, he went on to take the Grade I Del Mar Futurity and Grade I American Pharoah at Santa Anita. Jaywalk has now won four of her five career starts.
With 222 points, Roaring Lion now holds a clear lead in both the Cartier Horse of the Year and Cartier 3-year-old colt categories. Joel Rosario is riding the favorite No. 5 Disco Partner (7-2), and I never have a problem backing Rosario.
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"He broke well but then he took a false step and lost his position and I had to look for a plan B", Dettori said. "I was on the outside and had to use him a little bit". Law enforcement then managed to get him off the horse and arrest him. "She came out of the race well and Mark and (owners Penny and Manfred Conrad) will have to talk about what is next for her".
Hopes of a wins in the $6m Classic run on Dirt, however, were dashed despite Saeed Bin Suroor-trained Thunder Snow finishing third to John Sadler-trained favourite Accelerate.
Baffert was looking to do the same as two of his horses, McKinzie and West Coast, were competing in the showcase race. They finished seventh and 12th, respectively, after projections of challenging Accelerate in the marquee event of nine season-ending championship races. The official attendance for Friday was 42,249, Churchill Downs said.
It's rare to see talented colts stay on the track long enough to mature when the more lucrative option is to retire them, which was partially the case with Justify.
Mendelssohn, a familiar name from the Triple Crown circuit earlier in the year, rounded the turn ahead of the pack in what's always been deemed the Super Bowl of horse racing. He is now 10-for-22 lifetime and though triple crown victor Justify is the likely horse of the year, Accelerate clinched an Eclipse Award himself with the win.
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For as impressive as it was going forward, the Gunners always looked vulnerable and should have been behind at the half. Virgil van Dijk was unmarked in the box as he controlled the ball from Mohamed Salah's cross into the box.
Gosden said: "It was a big ask for our filly, and she greatly deserved it". The bay daughter of Lope de Vega, who captured the Grade 2 Miss Grillo at Belmont on September 30, was first out of the gate and first home in the one-mile turf event, stopping the clock in 1:39 flat over a yielding turf. Jockey Florent Geroux collected his fifth win.
New York-based connections celebrated in four of Future Stars Friday's five races led by jockey Joel Rosario who scored wins in the Tito's Handmade Vodka Juvenile Fillies and featured Sentient Jet Juvenile on opening day of the Breeders' Cup from Churchill Downs in Louisville, Kentucky.
There was some bumping and grinding for Game Winner on the way to victory in the $2 million Breeders' Cup Juvenile.
Enable followed up last month's Arc de Triomphe victory by winning the $4 million Turf by 3/4 lengths over Magical. She has now won nine races in a row, including the Turf, two Arcs, two Classics and the King George at Ascot. She earned her 10th win from 11 career starts.
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