New York Francis TFO and Taylor Fritz set up an All-American semi-final at the US Open with victories Tuesday guaranteeing the United States a man in the title match at the country's Grand Slam Tournament for the first time in 18 years the 20th seated TFO made it to the final four at Flushing Meadows for the second time in 3 years when his quarterfinal opponent Gregor demitro stopped playing because of an injury in the fourth set tifo was leading 6 to3 6-7 5 6-3 4 to1 with midnight approaching when demitra retired from the match providing an anticlimactic ending to a contest that was not necessarily of the highest quality