Francis tiao advances to US Open semi-finals after Gregor Deitra injury Francis tiao showcased incredible skill reaching the US Open semi-finals for the second time his quarterfinal match took a turn when Gregor demitro suffered an unfortunate injury Gregor demitro stopped playing because of an injury in the fourth set tifo was leading 6 to3 7-6 5 6 to3 4 to1 with midnight approaching when demitro retired from the match this marks a significant achievement for tifo solidifying his status as a top Contender fans are excited to see tfo's performance in the upcoming semi-finals at the US Open follow us for more thrilling sports updates