The fourth-seeded southpaw beat the former top-10 American 6-7 (3), 6-2, 7-6(5) in a tight round two contest, which lasted almost three hours.
Roger Federer and Alexander Zverev combined to beat Jack Sock and Denis Shapovalov 6-3, 7-5 to give Team Europe a 3-1 lead over Team World in the Laver Cup.
The pair won its second straight Grand Slam doubles title together, beating Lukasz Kubot and Marcelo Melo 6-3, 6-1 on Friday at the U.S. Open.
Federer emerged from the tunnel of smoke and walked onto the court greeted by roars and thousands of camera phones held high for the first Bay Area appearance of his career.
Jack Sock finished the group stage with a 2-1 record and will next face Grigor Dimitrov in the semifinals of the year-ending tournament on Saturday.
The 25-year-old American turned things around at the end of the season as he ended up earning a debut appearance at the ATP Finals, starting with a match against 19-time major champion Roger Federer on Sunday in London.
After winning his first Masters title, Sock will be making the short trip to England to compete against Roger Federer and the other six who made it from the ATP race.
Krajinovic plays for his first career title against 16th-seeded American Jack Sock, who comfortably beat home favourite Julien Benneteau 7-5, 6-2 in the other semi-final.
New York: Seventeen-time Grand Slam winner Roger Federer said he has been surprised by the record number of players who have had to retire because of heat at the ongoing US Open.Jack Sock and Denis
LONDON : American Jack Sock and Canadian Vasek Pospisil made their first tournament together a championship-winning one by defeating Bob and Mike Bryan 7-6 (5), 6-7 (3), 6-4, 3-6, 7-5 in the Wimbledon doubles final.
HOUSTON : Jack Sock made short work of former champion Ivo Karlovic, winning 6-1, 6-4 in the first round of the U.S. men's Clay Court Championship on Monday. The 21-year-old American had lost both previous
New York, Sept 10: American teenagers Melanie Oudin and Jack Sock won the U.S. Open mixed doubles title Friday night, beating eighth-seeded Gisela Dulko and Eduardo Schwank of Argentina in a tiebreak.Oudin and Sock won
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