Yes, the fight was over.
Mayweather won!
though mayweather has to pay some 6-digit figure to Marquez due to his 146 pounds weight during the fight. The boxers has agreed to fight within the 147 pounds limit, but a special clause saying a penalty for every pound in excess of 144.

The most awaited fight will start in a few hours - who will maintain the title as number one pound for pound fighter?

You can watch online for free - but most probably they will only be replays or - fake links. Better, spend some dollars in watching the fight in the big screen of theaters, or online pay per view. Else, you can watch the free live streaming of marquez vs mayweather here.