Given a spot in the draw only after Azarenka pulled out Friday, Davis took advantage of shaky play by Madison Keys in the decisive tiebreaker to win their second-round match, 6-1, 5-7, 7-6 (7).

Davis trailed 6-3 in the tiebreaker and then saved three match consecutive points, all on unforced errors by Keys.

The victory was the first of Davis’ career at Key Biscayne, and the 19-year-old Ohio native barely made the tournament. She learned at 10 a.m. that Azarenka had withdrawn, and an hour later she was playing on the stadium court.

(© 2013 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)