Northern Ireland 's Graeme McDowell had a day of wildly fluctuating fortunes . Australian and U.S. teams lead World Cup of Golf at Royal Melbourne after rounds of 66 . World Cup format changes in 2013 becoming an individual event with team component . Home favorite Adam Scott shoots a quintuple nine at par for par in round of 75 .
Australian and U.S. teams lead World Cup of Golf at Royal Melbourne after rounds of 66 . World Cup format changes in 2013 becoming an individual event with team component . Home favorite Adam Scott shoots a quintuple nine at par for par in round of 75 .