CNN a no American man has won a grand slam singles title since Andy rodic at the 2003 US Open a but there is now a chance that drought could end this weekend an American man is guaranteed to play in the US Open final a first for a grand slam singles final since 2009a after us star Francis diafa Advanced to the semi-finals his opponent world number n Greer diit RV of Bulgaria retired with an injury in the fourth set of their quarterfinal with TFO leading 63 67 75 63 41 he will play fellow American Taylor Fritz in the semi-finals on Friday Fritz the highest ranked American man at number 12 booked his spot in his first major semifinal with a 76 72 36 64 76 73 win against number four Alexander forever Germany on Tuesday DFO ranked number 20 and matching his best result at a major had a dream run to the US Open semi-finals two years ago