 Liezel Huber and Arantxa Sánchez Vicario, are both six time Grand Slam title winners of what sport?
professional tennis player.
Title: Arantxa Sánchez Vicario
Passage: Aránzazu Isabel María "Arantxa" Sánchez Vicario (] ; born 18 December 1971) is a Spanish former World No. 1 professional tennis player.  She won four Grand Slam singles titles, six Grand Slam women's doubles titles, and four Grand Slam mixed doubles titles.  In 1994 she was crowned the ITF World Champion for the year.
Title: Liezel Huber
Passage: Liezel Huber (née Horn; born 21 August 1976) is a South African-American retired tennis player who represents the United States internationally.  Huber has won four Grand Slam titles in women's doubles with partner Cara Black, one with Lisa Raymond, and two mixed doubles titles with Bob Bryan.  On 12 November 2007, she became the co-World No. 1 in doubles with Cara Black.  On 19 April 2010, Huber became the sole No. 1 for the first time in her career.
Title: 1995 Wimbledon Championships – Women's Singles
Passage: Conchita Martínez was the defending champion, but she lost to Arantxa Sánchez Vicario in the semifinals.  Steffi Graf defeated Sánchez Vicario 4–6, 6–1, 7–5 in the final to win the Ladies' Singles tennis title at the 1995 Wimbledon Championships, giving Graf the sixth Wimbledon title of her career.
Arantxa Sánchez Vicario Liezel Huber