PGA Tour star Angel Cabrera -- who won the 2009 Masters -- was sentenced to 2 years behind bars on Wednesday ... after he was convicted of assaulting his ex-girlfriend.
The 51-year-old learned of the prison sentence at an Argentinian court.
Officials say the golfer -- known as "El Pato" on the Tour -- roughed up, threatened and harassed his former partner.
Cabrera had denied the allegations during his trial.
As we previously reported, several women had accused Cabrera of being violent with them ... with one of the woman alleging he had punched her in the face and tried to run over her with his car in 2016.