Maria Sharapova successfully defends WTA Stuttgart title . ( CNN ) -- She beats China 's Li Na in Sunday 's final in straight sets . The Russian is the first woman to win a Grand Slam singles title since Steffi Graf did it at Wimbledon in 1993. Winner of Stuttgart tournament also lands a Porsche sports car .
Maria Sharapova successfully defends WTA Stuttgart title . She beats China 's Li Na in Sunday 's final in straight sets . The Russian is the first woman to win a Grand Slam singles title since Steffi Graf did it at Wimbledon in 1993. Winner of Stuttgart tournament also lands a Porsche sports car .