The undefeated filly Awesome Feather, who is virtually certain to be named an Eclipse Award champion on Monday, has been sidelined by a tendon issue.

The filly was purchased for $2.3 million by Frank Stronach at Fasig-Tipton two days after her season-ending victory in the Breeders' Cup Juvenile Fillies. Stronach transferred his new runner to Mechanicville native Chad Brown, who said the filly's tendon trouble began shortly after she arrived at his Palm Meadows barn.

Awesome Feather hasn't returned to the track since her Breeders' Cup win. She's currently walking and undergoing therapy.

Although Brown didn't completely rule it out, it seems unlikely Awesome Feather will run this spring. Her status for the Kentucky Oaks, a race she was the winter-book favorite for, is certainly in jeopardy.