New York Yankees' right-hander Joba Chamberlain was hoping to come back this season after undergoing Tommy John surgery in June.

Now he faces another battle.

Chamberlain underwent surgery last night after suffering an open dislocation of the right ankle while playing with his son.  General Manager Brian Cashman termed it a "significant" injury.

Chamberlain is scheduled for an MRI and CT Scan later in the day.

The Yankees weren't expecting Chamberlain to return until at least June, but his rehab was ahead of schedule and he hoped to come back earlier.