American John Isner and Serbian world No. 2 Novak Djokovic completed the men's semifinal line-up at the BNP Paribas Open, scoring straight-set wins here over Latvia's Ernests Gulbis and Frenchman Julien Benneteau, respectively.

The six-foot, 10-inch Isner fired 13 aces in a 7-6 (7-4), 7-6 (7-3) victory over Gulbis in Friday's second men's quarterfinal at this elite hard-court event.

Neither player lost his serve in the first set, which Isner wrapped up in a tiebreaker with one final big serve up the T.

Gulbis struck quickly at the start of the second set by breaking the American's serve at love, but he squandered a chance to serve out the set at 5-4 - netting a backhand on break point - and the players headed to another tiebreaker.

In that "breaker," Isner grabbed a mini-break lead after Gulbis committed a double fault and then wrapped up the contest in one hour and 49 minutes with a backhand down-the-line passing shot.

"Seems like I always have a little bit more adrenaline in those situations, and that was certainly the case out there today," Isner said afterward.

"I certainly hit my biggest serves in those tiebreakers. I think especially the second set one I was going after it with everything I had. They found their mark, too. Helped a lot."

Next up for Isner in Saturday's semifinals will be Djokovic, who found his top form in a 6-1, 6-3 rout of Benneteau in Friday's first men's quarterfinal.

Djokovic, who came up short in January in his bid for a fourth-straight Australian Open title, is still looking to win his first tournament of the 2014 season.

"I came into Indian Wells without a title in this season and that is a different feel from previous years," Djokovic, who lost to Isner two years ago in the Indian Wells semifinals but has a 4-2 lead in their career head-to-head, said after his quarterfinal win.

"I'm on the right path and playing (in the) semifinals, which is always of course a challenge and a good result, but I want to try to go as far as I can."

Saturday's first men's semifinal will pit Switzerland's Roger Federer against Ukrainian Alexandr Dolgopolov, who upset Spanish world No. 1 Rafael Nadal on Monday.

Also Friday, Italy's Flavia Pennetta and Poland's Agnieszka Radwanska booked their spots in the women's final.

Pennetta stunned top seed and reigning Australian Open champion Li Na of China 7-6 (7-5), 6-3, wrapping up the night match with a down-the-line backhand winner.

In the first semifinal, Radwanska got revenge for a loss earlier this season to Simona Halep, defeating the Romanian 6-3, 6-4 Friday evening.

Both the women's and men's finals will be played on Sunday.

The BNP Paribas Open is one of the biggest hard-court events on the ATP and WTA calendars. EFE