Close between Roddick and Murray, if Andy will finish his career just with 1 slam he will be for sure best ever with 1 slam, right now probably Roddick is leading by little margin, thanks to his No.1 ranking. But Murray is very close and even if he ends up with 1 slam, he will add many more titles, Masters 1000 and many weeks-years in top 5 so he would accomplish visibly more than Roddick for sure.