(Reuters) Investors cut their bets on hedge funds at the fastest pace for six months in July, data showed on Tuesday, as the Greek debt crisis, concerns over Chinese economic growth and U.S. interest rate uncertainty made for volatile global markets.The SS&C GlobeOp Capital Movement Index, which calculates monthly hedge fund subscriptions minus redemptions at the start of each month, fell 2.7 percent in July, the fastest rate since a 3.3 percent drop in January.