( CNN ) -- Stacy Lewis is the new women 's world No . 1 after winning the HSBC Women 's Champions . Lewis is only the second player to occupy the position and the second American . Yani Tseng underwent back surgery for scoliosis 109 weeks . Previous No . 1 Yani Tseng had topped the rankings for 10 years ago .
Stacy Lewis is the new women 's world No . 1 after winning the HSBC Women 's Champions . Lewis is only the second player to occupy the position and the second American . Yani Tseng underwent back surgery for scoliosis 109 weeks . Previous No . 1 Yani Tseng had topped the rankings for 10 years ago .