England's Georgia Hall lost out to France's Celine Boutier in a play-off at the LPGA Drive On Championship.
Boutier, 29, birdied the 18th hole to join Hall on 20-under before securing her third LPGA victory with a birdie at the first extra hole.
Hall, 26, who shot a joint-best final round of 65, narrowly missed her own birdie attempt in the play-off.
Japan's Ayaka Furue finished third on 19-under in the tour's first full-field event of the season in Arizona.
Boutier held the lead after three rounds at Superstition Mountain Golf & Country Club and set up a play-off after carding a four-under 68.
Hall fired seven birdies and an eagle during her seven-under round but former Solheim Cup team-mate Boutier birdied the par-five 18th to take the tournament to an extra hole.
"I was honestly not looking forward to it," Boutier said of facing Hall in the play-off.
"It's a bittersweet feeling because you obviously want to win, but at the same time I really think she's an amazing player.
"She is a really good friend of mine. So I feel like it's not always easy, but also I'm a little bit competitive, so I feel like I definitely want to win as well. But it's not the greatest feeling."
Hall said: "Obviously [it was] fantastic to get to the position I was in. I knew I had to shoot low today, and obviously [I'm] gutted about the play-off."