James, they are fighting at 154 that's why the 10 oz gloves. I read on some MMA sights where they claim Mayweather can't handle 8 oz gloves, but some of Mayweather's best work has been with 8 oz gloves including the Pacman fight and Maidana 2.
Take care.
Big Ron
The Hunt for Whitey
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Recognizing and Surviving the Condition of Anarcho-Tyranny