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…