Juan Martin del Potro closed in on a World Tour Finals place by beating Robin Haase 7-5, 6-4 in the Paris Masters last-16 on Thursday. Sock has never won a Masters title and can qualify for the season-ending ATP Finals in London if he does so here.
Despite a 31-ace performance, Isner was caught out in the final-set tiebreaker as the 77th-ranked Krajinovic returned a big serve with interest, earning a match point against the biggest man on the tour.
Jack Sock of US in action against Julien Benneteau of France during the semi final match against during at the Rolex Paris Masters tennis tournament in Paris, France, 04 November 2017. World No. 1 Rafael Nadal is a question mark for London after pulling out of Paris with a knee injury, but Del Potro has plans to head home instead of waiting around to be an alternate. "It was mentally really tough because, you know, getting older and older all sponsors said no to me".
Filip broke him just once, from a lone break point he gained, and the Serb fends off 5 break points to keep his serve intact throughout the match, showing clutch and determination in the crucial moments to edge the American and continue his Paris dream. I don't know what's going through his head, but I can't control that. Because I was a good junior and then all of a sudden when I needed to do something I didn't do anything.
Isner is also still in the running for a spot in the Nitto ATP Finals, which would be his first appearance at The O2.
Now his compatriot Sock is the only man who can deny Carreno Busta. With an unreturnable serve on his first match point, Isner topped del Potro for only the third time in nine matches.
Krajinovic looked to be the fitter player, having had a day off due to Nadal's withdrawal, while Isner had been taken to a deciding set in all of his three previous matches. That meant almost taking the American out at the net.
He is bidding to become the first qualifier to win a Masters event since Albert Portas took the 2001 title in Hamburg, having only won one match at this level in his career before arriving at Bercy.
'He said I'm sorry to me 10 times, like a kid who's done something wrong. "I knew that one day everything will come back".
Everything could have been much different if John converted any of the 3 break points he had in the opening return game, but Filip repelled them all with some fine groundstrokes, especially from the backhand side, to avoid an early setback.
The world number 22 was by far the stronger player and completed victory with a run of four straight games.
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