Day four dawned dry after Wednesday's wash out and play was brought forward to 11:00 BST to catch up on the backlog of matches.
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It wasn't a good day for French Open champion Garbine Muguruza. She was upset by Slovakia's Jana Cepelova 6-3 6-2.
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America's five-time champion Venus Williams was handed a slot on court 18, Wimbledon's smallest show court -- a decision which attracted criticism.
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The eighth seed was taken to three sets but beat Greece's Maria Sakkari 7-5 4-6 6-3.
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Another Wimbledon winner, Andy Murray, routed Yen-Hsun Lu 6-3 6-2 6-1 to progress.
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Canadian sixth seed Milos Raonic, who is co-coached by three-time champion John McEnroe, breezed past Italy's Andreas Seppi 7-6 6-4 6-2.
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France's Nicolas Mahut dispatched Spain's David Ferrer, the 13th seed, 6-1 6-4 6-3.
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America's Madison Keys, seeded 9, won in three sets against former semifinalist Kirsten Flipkens of Belgium.
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Kei Nishikori was first up on Centre Court against France's Julien Benneteau and despite losing the first set the Japanese won in four to reach the third round for the fourth time.
