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The tournament is about a dozen matches behind schedule due to rain delays, with more showers forecast Thursday.

Play on Centre Court is guaranteed because of the roof, meaning fifth-seeded Robin Soderling will lead off Thursday against 2002 champion Lleyton Hewitt. They will be followed by French Open champion Li Na of China against Sabine Lisicki and six-time winner Roger Federer against Adrian Mannarino of France.

The Court 1 schedule features matches involving Novak Djokovic, Jo-Wilfried Tsonga and 2004 champion Maria Sharapova.

Serena Williams is scheduled to play on Court 2 against Simona Halep of Romania. Top-ranked Caroline Wozniacki is also due on Court 2, against Virginie Razzano.

Other winners Wednesday included defending men’s champion Rafael Nadal, fourth-seeded Andy Murray and three-time runner-up Andy Roddick. They all won convincingly in straight sets.

The roof remained over Centre Court for Nadal’s 6-3, 6-2, 6-4 win over Ryan Sweeting of the United States.

“The Wimbledon Centre Court with the roof or without the roof, is probably the best court of the world,” Nadal said.

Nadal’s next opponent will be Gilles Muller of Luxembourg, who advanced after Canadian Milos Raonic retired with a hip injury while leading 3-2 in the first set Wednesday.

Muller is the only man other than Federer to beat Nadal at the All England Club since 2005. Six years ago, Muller defeated the Spaniard 6-4, 4-6, 6-3, 6-4 in the second round. Nadal is 28-2 at Wimbledon since then, with both losses coming in the final against Federer.

“Was a long time (ago), but he beat me,” Nadal said of Muller. “Gilles is a very dangerous player. He has a very good serve, good volley. He’s especially very dangerous player in this kind of surface. So will be tough match for me.”