Tsonga, Isner march on at US Open

French ninth seed Jo-Wilfried Tsonga needed four sets to get past James Duckworth of Australia to reach the third round at the US Open on Wednesday.

Tsonga was kept on court for over three hours before he defeated Duckworth 6-4, 3-6, 6-3, 6-4 to set up an interesting third round match against South African Kevin Anderson.

The match started in the worst possible way for Duckworth when he dropped his serve in the first game. Things went with serve until the Frenchman won the opening set 6-4 on his first set point.

The Australian bounced back immediately early in the second by breaking his opponent's serve in the second game to eventually claim the set 6-3 to even things up at a set apiece.

The Frenchman broke early to lead 2-0 in the third. Things went with serve and in the eighth game, Duckworth saved seven set points to make the score 3-5 only for Tsonga to claim the set 6-3 by holding his serve.

In the fourth set, Duckworth had his serve broken in the ninth game and Tsonga served out the match winning the set 6-4.

In other second round results, big serving American 20th seed John Isner needed four sets to down Steve Darcis of Belgium 6-3, 6-4, 6-7(10), 6-3 in two hours and 57 minutes.

A break of serve in the fourth game was all Isner needed to claim the opening set 6-4 and he followed that up in the second with a solitary break in the fifth game to claim the set 6-4.

In a tight third set, there were no breaks of serve and things proceeded to a tie-break which Darcis won 12-10 saving four match points in the process to claim the set.

Things went with serve until Darcis dropped his in the eighth game for Isner to serve out the set 6-3 and win the match. He next faces Britain's Kyle Edmund in the third round.

In an upset, crowd favourite Marcos Baghdatis of Cyprus beat French 32nd seed Benoit Paire 6-2, 6-4, 3-6, 6-4 in a match where he always had the edge.