KEY BISCAYNE, Fla. — Serena Williams screamed at herself, broke her racket and then finally finished off Jelena Jankovic 6-1, 5-7, 6-3 today for her fifth title at the Sony Ericsson Open.

Williams survived an improbable comeback by Jankovic, who trailed 5-3 in the second set, and some shaky play down the stretch. Williams failed to convert seven match points in the final set, then finished the job with an overhead slam.

Williams, who grew up in nearby Palm Beach Gardens, also won the tournament in 2002-04 and 2007. She matched Steffi Graf's record of five women's titles, while Andre Agassi won the tournament six times.

Williams improved to 14-1 this year, with her only loss coming to Jankovic in the quarterfinals at the Australian Open.