"Very, very disappointing," admitted Isner. "I had an opportunity here to do some things that I've never done before, finish in the top 10 in the world. I mean, it's very good. It's consistent."

"You can say either it's not good or it's really good," added Isner, last year's runner-up behind Andy Murray.

Isner's fellow American Sock continued his own dream of clinching the Finals spot, as he saw off home favorite Julien Benneteau 7-5, 6-2.

Sock, coming in this week No. 24 in the ATP Race to London, could overtake Spain's Pablo Carreno Busta and secure last spot of the Finals if he won the title on Sunday.

"I was able to go out today and play my game, swing big, play some good tennis and get through. Tomorrow is just a good opportunity for me to go out and try to compartmentalize all the things that would come with winning tomorrow, just go out and play my tennis again," he said.

Benneteau, 35, overcame Jo-Wilfried Tsonga, David Goffin and Marin Cilic en route to the semifinals. He received lopsided support from crowds in the AccorHotels Arena, but it seemed that in the second set, he ran out his energy against Sock, who is 10 years younger than him.

"He hurt me from the start with certain rallies where he was controlling the point with his forehand. He was better than I was in all parts of the match," commented the Frenchman.

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