Yani Tseng is a Taiwanese professional golfer playing on the U.S.-basedLPGA Tour. She is the youngest player ever, male or female, to win five major championships and is ranked number 1 in the Women's World Golf Rankings. Tseng turned professional in January 2007. That year she competed on the Ladies Asian Golf Tour and won the DLF Women’s Indian Open. She also competed on the CN Canadian Women’s Tour where she won the CN Canadian Women’s Tour at Vancouver Golf Club. In June 2008, she claimed her first LPGA tour victory at the LPGA Championship to become the first player from Taiwan to win an LPGA major championship. Tseng was named LPGA Tour Rookie of the Year in 2008. On 29 March 2009, Tseng became the fastest player in LPGA history to reach the $2 million mark in career earnings.
On 4 April 2010, Tseng won the first major championship of the LPGA season, the Kraft Nabisco Championship, by one stroke. She went on to win her second major of the year on 1 August 2010 by winning the Women's British Open by one stroke and became the youngest woman in the modern era to win three major championships. In January 2011, Tseng defended her title at the Taifong Ladies Open on the LPGA of Taiwan Tour. Three weeks later she won the ISPS Handa Women's Australian Open and a week later the ANZ RACV Ladies Masters. In June 2011, she won the LPGA State Farm Classic over Cristie Kerr by three strokes. Two weeks later, she won the LPGA Championship. This made her the youngest player to win four LPGA majors. The next month she defended her title at the Women's British Open. Her impressive statistics helped her win the LPGA Tour Player of the Year for a second straight year. Tseng won three of the first five events on the 2012 LPGA Tour: the Honda LPGA Thailand, the RR Donnelley LPGA Founders Cup and the Kia Classic.