The CME Group Tour Championship features a record $4 million prize for the winner, marking the largest single-day payout in women's golf history.

Narin An leads the tournament after an impressive first-round performance, shooting 8-under 64 at Tiburon Golf Club.

American Angel Yin is closely trailing An, finishing the round at 7-under after scoring 30 on the back nine, which included an eagle on the 17th hole.

World number one Nelly Korda, who has had a stellar season with seven wins, struggled in her opening round, shooting an even-par 72.

Lydia Ko acknowledged the difficulty of the course and set a goal to improve her performance after seeing An's low score.

Ireland's Leona Maguire is at 3-under, remaining in contention after carding four birdies in her round of 69.

Former U.S. Women's Open champion Allisen Corpuz and Marina Alex are tied for third place at 6-under, just two shots behind An.

An, a 28-year-old from South Korea, is seeking her first LPGA win and expressed satisfaction with her putting during the round.

Despite challenging windy conditions typical of the Gulf Coast, nearly half of the 60-player field shot in the 60s during the first round.

The opening round coincided with the LPGA awards night, where Korda was named Player of the Year and Lydia Ko was honored for her Olympic gold medal.

The tournament winner will break the LPGA record for most money earned in a season, previously held by Lorena Ochoa since 2007.

Albane Valenzuela, who shot 67, reflected on her strong year and emphasized the importance of focusing on performance rather than the prize money.