Melanie Oudin defeated Julia Goerges of Germany 7-5, 6-3 in the first round of the Sony Ericsson Open on Tuesday.
Oudin led 5-2, but allowed Goerges to pull even before winning the first set.
American wildcard Madison Keys, a 16-year-old ranked No. 421, took Patty Schnyder of Switzerland to three sets before falling 3-6, 6-1, 7-6 (2).
Keys trains at the nearby Evert Academy.
Men's first-round play begins on Wednesday.