The Cahir native took to the octagon last night at the o2 Arena in Prague last night, in front of 20,000 spectators.
The 35-year-old beat reigning champion and hometown fighter Karlos Vemola by unanimous decision, with all of the three judges scoring the fight 50-44 in favour of Fleury.
The Tipp man now holds a professional record of 14-3 and is the first Irish man to hold a belt in the Oktagon promotion.
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