SAN ANTONIO — Welterweight Oscar Diaz spent the night in surgery after collapsing between rounds of a nationally televised bout in his hometown.

The 25-year-old was taking a beating from Delvin Rodriguez on Wednesday night at San Antonio's Municipal Auditorium when he collapsed on his stool at the beginning of the 11th round.

Referees stopped the fight and doctors jumped into the ring to attend to Diaz. He was placed on a stretcher and taken to University Hospital. Dr. Wayne Lee, a ringside physician, said Diaz was unconscious and unresponsive but was breathing on his own and had a blood pressure.

Promoter Donna Brooks told the San Antonio Express-News that Diaz was to have surgery overnight for suspected bleeding in his brain.

Hospital spokeswoman Leni Kirkman had no new information on the 5-foot-10, 147-pound fighter Thursday morning.