PARIS (Reuters) - John Isner pushed on toward a Tour finals spot on Friday when he made it through to the semi-finals of the Paris Masters with a 6-4 6-7(5) 6-4 win against Argentine Juan Martin Del Potro.
The American, last year's runner-up, needs to win the tournament if he is to clinch the last ticket for the season-ending event at the O2 in London from Nov. 12-19.
Del Potro would have claimed it if he had won. But ninth seed Isner was more consistent as he set up a meeting with Serbian qualifier Filip Krajinovic, who advanced after world number one Rafa Nadal withdrew injured.
The other quarter-finals feature France's Julien Benneteau against third seed Marin Cilic of Croatia and American Jack Sock against Spain's Fernando Verdasco.
(Reporting by Julien Pretot; Editing by Andrew Heavens)