Yani Tseng during the KPMG Women’s PGA Championship at Sahalee Country Club. (Kelvin Kuo-USA TODAY Sports)

2. Yani Tseng

Taiwan’s first No. 1 player dominated the first part of the decade, winning 13 times from 2010 to 2012. She collected four majors during that span and two LPGA Player of the Year titles before her game took an astonishing plunge.