Prosecutors say a jury on Thursday convicted the 24-year-old Burgos of assaulting the woman in September 2008. He faces up to a year in jail when he is sentenced April 3.
District Attorney Richard Brown's office says Burgos threw his then-girlfriend against a wall and repeatedly punched and slapped her when she tried to leave. Prosecutors say Burgos then stepped on the woman and pummeled her as she lay on the floor.
Burgos' lawyer, Edgar De Leon, didn't immediately return an after-hours message seeking comment.
The Mets released Burgos in December.
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