The filly Untapable is the 2-1 favorite for her first race against the colts, the $1 million Haskell Invitational on Sunday at Monmouth Park.

Untapable is 4 for 4 this season, winning by a combined 30-3/4 lengths against 3-year-old fillies. Her victories include the Kentucky Oaks at Churchill Downs and the Mother Goose at Belmont Park.

This will be her biggest challenge, attempting to join Rachel Alexandra (2009) and Serena's Song (1995) as the only fillies to win New Jersey's top thoroughbred race.

"When the year started, our goal with her was the Kentucky Oaks," said trainer Steve Asmussen who also conditioned Rachel Alexandra. "That performance, and how she has trained since, convinced us this is right time to take this chance."

She will break from post 7 in the nine-horse field with Rosie Napravnik aboard for the 1-1/8 miles race.

Bayern, trained by Bob Baffert who has won the Haskell a record six times, is the 5-2 second choice from post 2.

Most recently, he was the dominant 7-1/2-length winner of the Woody Stephens Stakes on the Belmont Stakes undercard.

Martin Garcia will ride, replacing Gary Stevens who recently underwent right knee replacement surgery.

The full Haskell field, in post position order with odds:

Encryption, 20-1; Bayern, 5-2; Albano, 6-1; Irish You Well, 12-1; Just Call Kenny, 10-1; Social Inclusion, 8-1; Untapable, 2-1; Wildcat Red, 10-1 and Medal Count, 8-1.