Oscar Collazo is a unified champion.

The 27-year-old Puerto Rican boxer defeated Thammanoon “Freshsmart” Niyomtrong on Saturday at The Venue in Riyadh, Saudi Arabia in a seventh-round stoppage to unify two minimumweight world titles.

Collazo (11-0, 8 KOs) added the WBA belt to his WBO title after ending the eight-year reign of Niyomtrong (25-1, 9 KOs) and handing the Thai boxer his first professional defeat.

Collazo dropped Niyomtrong in Round 6, then again with a right hook in the seventh before finishing the fight moments later with stunning left uppercut.