Williams broke Azarenka a third time at 5-5 in the second set and served out for her 42nd singles title on the WTA Tour.
Unlike last year, Williams didn't lose a set, and in the final she lost her serve only once to Azarenka, ranked No. 6, one spot behind Williams.
Suzann Pettersen had her third straight bogey-free round, shooting a 4-under 68 and opening a five-stroke lead in the season-opening Honda PTT LPGA Thailand. The 2007 champion from Norway is 18-under 198 for the tournament. She shot a 66 and 64 in the first two rounds.
Armour , Simpson tied
The Champions Tour newcomer of the year, Armour put together a stretch of five straight birdies on the back side to finish with an 8-under 64. Simpson joined Armour after he eagled the par-5 18th.
Poulter reaches final
Ian Poulter reached the final of the Match Play Championship with an easy victory over Sergio Garcia in the nastiest weather of the week in Marana, Ariz. Poulter built an early lead in the wind, rain and cold, and went on to a 7-and-6 victory.
Ex-Giant Allen arrested