Fourteen-year-old American Madison Keys won on her WTA Tour debut with a 7-5, 6-4 first round win over Russian Alla Kudryavtseva at the Ponte Vedra Beach championships on Monday.
Keys, who is 5-feet-10 and has a serve that tops 100 mph, fought back from 2-5 down in the opening set to upset Kudryavtseva, ranked 81 in the world, and set up a possible second round meeting with Russian top seed Nadia Petrova.
Petrova opens play on Tuesday against compatriot Olga Govortsova.
Keys, who made her professional debut at the $25,000 Challenger at Fort Walton Beach this month, becomes one of the youngest players to win a WTA match.
American Mary Joe Fernandez holds the record, notching her first victory at 13 years seven months, according to the WTA.