Helen Newington Wills (October 6, 1905 – January 1, 1998), also known by her married names Helen Wills Moody and Helen Wills Roark, was an American tennis player. She won 31 Grand Slam tournament titles (singles, doubles, and mixed doubles) during her career, including 19 singles titles.
Wills was the first American woman athlete to become a global celebrity, making friends with royalty and film stars despite her preference for staying out of the limelight. She was admired for her graceful physique and for her fluid motion. She was part of a new tennis fashion, playing in knee-length pleated skirts rather than the longer ones of her predecessors, and was known for wearing her hallmark white visor. Unusually, she practiced against men to hone her craft, and she played a relentless predominantly baseline game, wearing down her female opponents with power and accuracy. In February 1926 she played a high-profile and widely publicized match against Suzanne Lenglen which was called the Match of the Century.
Wills had a 180-match win streak from 1927 until 1933. In 1933, she beat the eighth-ranked US male player in an exhibition match.