CARLSBAD, Calif.—Atthaya Thitikul, a 19-year-old rookie, won her first LPGA Tour title, shooting the tournament low score in the final round Sunday to eventually win in a play-off over Nanna Koerstz Madsen in the 2022 JTBC Classic at Park Hyatt Aviara Resort & Spa in north San Diego. With a field full of the world’s top players, Thitikul began the day six strokes behind Nanna Koerstz Madsen at 8–under, scoring nine birdies and a bogey to tie for the lead at 16-under and advance into a two-person playoff. Thitikul stated that she didn’t concentrate on winning the tournament, being so far behind, “I just wanted to focus on my game, try my best to give myself chances to make birdies.” From Thailand, Thitikul turned professional in 2020, winning four times on the Ladies European Tour. Thitikul is the youngest golfer ever to win a professional golf tournament, having won as a 14-year-old amateur …