Victor Ortiz tells TMZ, Floyd Mayweather screwed him out of a fair fight — catching him completely off-guard with a sucker punch … and now he wants a rematch.

Victor hit up The Ivy in Bev Hills yesterday — and told us, he only put his hands down because he was waiting for the ref's signal … and Floyd clocked him with a "totally unfair" left hook.

Watch Victor's rematch demand — he squeezes in a not-so-subtle dig at Money May.
 

 

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