Lleyton Hewitt

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Lleyton Hewitt, of Australia, celebrates after scoring a point against Robin Haase, of the Netherlands, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Hewitt won 3-6, 6-3, 6-3. (AP Photo/Alan Diaz)

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Matthew Ebden, of Australia, returns a shot against Lleyton Hewitt, of Australia, during a first round match at the BNP Paribas Open tennis tournament, Thursday, March 6, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Lleyton Hewitt, of Australia, returns a shot against Matthew Ebden, also of Australia, during a first-round match at the BNP Paribas Open tennis tournament on Thursday, March 6, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Lleyton Hewitt, of Australia, returns a shot against Matthew Ebden, of Australia, during a first round match at the BNP Paribas Open tennis tournament, Thursday, March 6, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Lleyton Hewitt, of Australia, hits a return to Michael Russell in the quarterfinal match at the U.S. National Indoor Tennis Championships, Friday, Feb. 14, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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Michael Russell, of the United States, hits a return to Lleyton Hewitt, of Australia, in the quarterfinals at the U.S. National Indoor Tennis Championships on Friday, Feb. 14, 2014 in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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Lleyton Hewitt, of Australia, watches his return of serve from Michael Russell, of the United States, in the quarterfinals at the U.S. National Indoor Tennis Championships on Friday, Feb. 14, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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Michael Russell, of the United States, leaps as he hits a return to Lleyton Hewitt, of Australia, in the quarterfinals at the U.S. National Indoor Tennis Championships on Friday, Feb. 14, 2014 in Memphis, Tenn. (AP Photo/Rogelio V. Solis)