Maria Sharapova is a professional tennis player from Russia. She has won five Grand Slam titles and is one of the most successful female players in the history of the sport. Sharapova has been ranked world number one by the Women's Tennis Association on five separate occasions. She has also been an Olympic medalist, winning a silver medal at the 2012 London Olympics. Sharapova is widely regarded as one of the greatest female tennis players of all time.