Monica Seles born December 2, 1973) is a former World No. 1 professional tennis player and a member of the International Tennis Hall of Fame. She was born in Novi Sad, Serbia, former Yugoslavia to Hungarian parents. She became a naturalized United States citizen in 1994 and also received Hungarian citizenship in June 2007. She won nine Grand Slam singles titles, winning eight of them while a citizen of Yugoslavia and one while a citizen of the United States.