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POTENT WEAPON

Pavlyuchenkova, the 21st seed, went for her shots but never found a way to counter the Williams attack. Nerves told again in the same game of the second set, where a series of errors allowed the American to break and then serve for the match.

"She was serving amazingly today," Pavlyuchenkova said. "She was there from the first point to the last."

Serena said she did not know how she had developed such a potent weapon.

"I'm not as tall as all the other players. So it's strange that I have such a strong, hard serve," she said.