Webb, now a 33-time winner on the LPGA Tour, also won the first major of the year, the Kraft Nabisco Championship, and the Michelob Ultra Open. Sunday, she beat 16-year-old Michelle Wie and two-time Evian Masters champion Laura Davies by one shot.
Annika Sorenstam tied for eighth place Saturday, but remained No. 1 overall again.
After Wie, Webb and Ochoa, Paula Creamer remained fifth and was again followed by Cristie Kerr, Juli Inkster, Yuri Fudoh and Jeong Jang, who will defend her Women's British Open title this week.
Mi Hyun Kim moved into 10th position, bumping Ai Miyazato to 11th. After that, Se Ri Pak, Hee-Won Han, Pat Hurst, Shiho Ohyama, Morgan Pressel, Natalie Gulbis, Seon-Hwa Lee, Brittany Lang and Sakura Yokomine rounded out the to 20.