Maria Sharapova
She has won 35 singles titles in her career, including five Grand Slam championships: Wimbledon in 2004, the US Open in 2006, the Australian Open in 2008 and the French Open in 2012 and 2014. She won an Olympic silver medal at the 2012 Summer Olympics. She is the world number 3 women's tennis player as of September 2015. In 2005, she was ranked world number 1 for the first time, and in 2012 for the last time.