The world no.1 pairing of Sania Mirza and Martina Hingis continued their march towards the Women's Doubles title at the US Open, recording a convincing straight sets win against the Italian duo of Sara Errani and Flavia Pennetta.

Pennetta, who had already competed in a grueling women's quarter-final encounter against Petra Kvitova earlier in the day, looked visibly exhausted taking the court for a second time, and that made the Italians easy meat for the top seeds.

While all the talk around town was on Serena vs Venus at Flushing Meadows on Tuesday, the men's draw provided plenty of entertainment as world no.1 Novak Djokovic and defending champion Marin Cilic produced some impressive tennis to book their spots opposite each other in the US Open semi-finals.

Cilic, a surprise winner here last year, has struggled for form most of this season, going through the typical honeymoon period most first time Grand Slam winners tend to enjoy. A return to New York though saw him stop on court last week with a renewed confidence and a desire to defend his title. It also meant that the Croatian superstar has walked around all week with a target on his back and plenty hoping to be the player to take him down.

The world no.1 team of Sania Mirza and Martina Hingis powered their way into the semi-finals of the 2015 US Open with a hard fought win against the Chinese Taipei duo of Yung-Jan Chan and Hao-Ching Chan.

The Chan sisters started the match really well and raced away to a 5-0 lead with Martina Hingis in particular well off colour. The Chan sisters had beaten Mirza and Hingis already this summer, but their quick start blew the Wimbledon champions away.

Five time US Open Champion Roger Federer stayed en route for an 18 Grand Slam title, quelling the challenge of big serving American John Isner in the fourth round of the US Open on Monday. Isner, who came into the match without having dropped his serve all week, finally succumbed to the excellence of the former champion, going down in three competitive sets, 7-6 (0) 7-6 (6) 7-5.

It was a battle of the serves on Arthur Ashe Stadium as the opening couple of sets made their way into tiebreaks, and though both breakers were polar opposites of each other, the net result was that Federer won both. The third set appeared to be heading in the same direction until Federer finally ended Isner's resistance, breaking serve for the first time in the match in the final game to book his place in the quarter-finals.

World no.1 Novak Djokovic overcame a barrage of forehands and a mid-match blip to beat the no.23 seed Roberto Bautista Agut in four well contested sets, 6-3, 4-6, 6-4, 6-3 in the fourth round of the US Open on Sunday night.

Djokovic appeared to be comfortably in control of the contest, leaving 6-3, 4-2 when he suddenly dropped 4 games in a row and Bautista Agut stormed back into contention in the match.

Now that the decision has been made, Taylor Fritz feels like he can relax and get down to the business of becoming a successful professional tennis player.

The 17-year-old Fritz from Rancho Santa Fe, Calif., two weeks ago decided to forgo a full-ride scholarship to play at USC, instead signing a professional contract with Creative Artists Agency (CAA) where he will be managed by agent Rick Montz.

Serena Williams moved yet another step closer towards tennis immortality as she crushed the challenge of fellow American Madison Keys 6-3, 6-3 in a little over an hour to move within three matches of a record equaling 22nd Grand Slam title and a Calendar Grand Slam.

A break in the 8th game of the first set put Serena comfortably in the driver's seat for taking the first set, and though Keys battled bravely to save four break points early in the second set, Serena broke serve in the 7th game and then again in the 9th to wrap up the second set and book her place in the quarter-finals.