After 12 rounds of boxing, Juan Diaz emerged on top after scoring a close split decision over Michael Katsidis to capture the IBO lightweight crown.
Two judges scored the bout 115-113 and 116-112 for Diaz while the third judge had it 115-113 for Katsidis.
Both boxers wanted to get back to their winning form after tasting their first career defeats earlier this year. Diaz and Katsidis lost to Nate Campbell and Joel Casamayor respectively last March.
The win improves Diaz to 34-1 and Katsidis drops to 23-2.