Francis tifo advances to the US Open quarterfinals while Gregor dimitrov is injured with wins on Tuesday Francis tifo and Taylor Fritz set up an All-American semi-final at the US Open ensuring that the United States would have a man in the championship match for the first time in 18 years the 20th seated tifo reached the last four at Flushing Meadows for the second time in three years when his quarterfinal opponent Gregor dimitrov retired due to an injury in the fourth set tifo was up 6 to3 6 to7 5 6 to3 4 to1 with midnight approaching when dimitrov withdrew creating an anticlimactic finale to a fight that was not always of the finest quality it's not the way I want to go through tifo said but I'm certainly glad to get through another semi final incredible just one example of the inconsistent play from both dimitrov had three set points in the tiebreaker 6 to3 on the first he made a double error on the