Unseeded John Isner hit 20 aces with just three double faults and rallied to a 4-6, 6-3, 7-6 (4) quarterfinal victory over top seed Tommy Paul in an all-American showdown at the Infosys Hall of Fame Open on Friday in Newport, R.I.Isner - who has won the tournament four times, most recently in 2019 - saw Paul narrow the third-set tiebreaker score from 5-2 to 5-4 before holding serve and winning on his first match point.
Isner saved six of eight break points, while Paul saved five of seven and hit 13 aces with seven double faults.The other quarterfinal match of the day also saw an upset, as unseeded Alex Michelsen took down No.
4 Mackenzie McDonald 6-3, 6-3. Michelsen won 81.6 per cent of his first-service points (31 of 38).Isner and Michelsen will meet in one semifinal match, with No.
2 seed Adrian Mannarino and No. 3 seed Ugo Humbert, both of France, set to contest the other.Nordea OpenThe top four seeds, led by No.