KEY BISCAYNE, Fla. (AP) - Trailing in the first set of her first match at the Sony Open, Serena Williams grunted with every shot and screamed with every point she won.
And then, on the pivotal point, she didn't make a sound - or take a swing.
Williams capitalized on a critical double-fault Thursday by Yaroslava Shvedova to survive a 69-minute first set and win, 7-6 (7), 6-2.
''It was an incredibly tough first set,'' Williams said. ''I just needed to relax and yet keep up the intensity.''
The top-ranked Williams seeks a record seventh Key Biscayne title, and her second in a row.