Top seed Novak Djokovic and third-seed Roger Federer have advanced to the third round of the Cincinnati Masters tennis tournament. Djokovic overcame early jitters in his first match since his triumph in Wimbledon in July to defeat American Sam Querrey 7-5 6-1.

Federer beat Argentine Juan Ignacio Londero in straight sets to also advance.

Querrey led 3-1 after breaking the World number one in the first game of the opening set, but the Serb broke back in the sixth game when the American netted a forehand to level the set at 3-3.

The defending champion went one-set up when Querrey sent a forehand long at set point. A break of serve in the fourth game of the second set saw Djokovic edge ahead 3-1. The Serb fired his 15th ace on match point to make up for his slow start on the sun soaked courts.

Federer joined Djokovic in the third round soon after with a 6-3 6-4 victory over Londero.

Having taken a one-set lead, Federer broke Londero in the fifth game of the second set to edge ahead 3-2. The third-seed secured victory when the Argentine netted a forehand at match point.

Swiss Stan Wawrinka overcame battling Bulgarian Grigor Dimitrov 5-7 6-4 7-6 in a roller-coaster first-round match. Dimitrov clawed back from a double break down in the decider to level at 5-5 and after Wawrinka broke again, Dimitrov forced the tiebreak.

The Swiss surged into a 4-LOVE lead, but Dimitrov rallied once more before Wawrinka closed out the match with an ace.

American Frances Tiafoe beat Frenchman Gael Monfils 7-6 6-3 and Canadian Denis Shapovalov came from behind to see off Portugal’s Joao Sousa 2-6 6-3 6-2.