So could you make money betting on boxing, tennis etc by covering your bets in the two participant countries? I've always wondered this...
Say Murray was playing Roddick, could you bet on Roddick with a UK betting site, and Murray with the US one and always make monies?
Yeah, people do it all the time, tried it a few times years ago. But Arbitrage is a slow and frustrating game. You gotta get big wedge down and then you win about £6, although the outcome doesn't matter. Unless you want to weigh it in one direction and then you could win say £12 for one person and break even if the other wins.