Germany’s Benjamin Becker caused the biggest upset at Wimbledon so far on Tuesday by knocking out fourth-seeded Russian Nikolay Davydenko 6-4, 6-4, 6-4. Davydenko has never shown any liking for grass and has lost in the first round in five of his last seven appearances.In a match dominated by baseline play it was Becker’s greater accuracy that was the difference and while Davydenko toiled diligently, he could not find the shots to counter Becker’s power. “Losing my serve in first, second and the third sets. it doesn’t matter against who I play, I need to play well. I need to have my serve going well and the return also needs to be as good as possible but today my return was really bad,” Davydenko said.Becker was happy with his achievement. Already there’s excitement in the crowd about Benjamin living up to the legacy of illustrious compatriot Boris Becker on grasscourts.Roddick rolls onSixth seed Andy Roddick defeated unseeded Argentine Eduardo Schwank 7-5,6-4, 7-6 (0) in a match that lasted two hours and 14 minutes on Court One. Rafael Nadal flexed his muscles at Wimbledon on Tuesday with a grinding 6-4, 6-4, 7-6 defeat of German qualifier Andreas Beck in the first round. Nadal was kept on his toes by some fierce Beck serving but was ruthless when the few opportunities arose, pocketing the first two sets with single breaks of serve. Left-hander Beck, making his Grand Slam debut, put up some dogged resistance in the third, not least when saving four break points at 3-3, and came within two points of snatching a set before Nadal romped through.Shaky start for Venus In women’s singles matches, defending champion Venus Williams overcame a shaky start to reach the Wimbledon second round with a 7-6, 6-1 victory over British wildcard Naomi Cavaday on Tuesday. Former champion Maria Sharapova enjoyed a low-key passage to the second round after seeing off French qualifier Stephanie Foretz 6-1, 6-4 on Tuesday. The 2004 winner and third seed, playing her first competitive match on grass this year, took full advantage of some error-strewn hitting from Foretz who is ranked outside the top 100. Lindsay Davenport defeated Renata Voracova 6-3, 5-7, 6-3 while Nadia Petrova beat Olga Govortsova 6-4, 6-4.