Park In-bee claimed her fifth LPGA Tour win of the year with a three-shot victory at the Lorena Ochoa Invitational.
The world number two carded an eight-under 64 in the final round at the Club de Golf Mexico to record a comfortable victory.
Park's triumph continued her fine form in 2015, which has seen her career title tally rise to 17.
The South Korean finished at 18 under in Mexico City, three shots clear of Spain's Carlota Ciganda, who closed with a fine 63.
And the 27-year-old was in no doubt which aspect of her game proved pivotal, saying: "I think it was definitely the putter, it was really good this week.
"I made a lot of birdies this week, it was a lot of fun with Carlota playing so well, I didn't know I needed an eight under to win today. So it was almost a perfect day I didn't make any mistakes, so I was able to focus on my game."