Donald Young returns a shot to Kei Nishikori, of Japan, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Kei Nishikori, of Japan, returns a shot to Donald Young at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Donald Young reacts after losing a point to Kei Nishikori, of Japan, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Ryan Harrison, of the United States, returns a shot to Donald Young, of the United States, in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Ryan Harrison, of the United States, returns a shot to Donald Young, of the United States, in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Donald Young, of the United States, returns a shot to Ryan Harrison, of the United States, in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Ryan Harrison, of the United States, yells after winning a point against countryman Donald Young in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Donald Young, of the United States, returns a shot to John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Donald Young, of the United States, returns a shot to John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
John Isner, of the United States, watches the flight of a shot to Donald Young, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
John Isner, of the United States, reacts to a call that went against him in a quarterfinal against Donald Young, of the United States, at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Donald Young, of the United States, celebrates after defeating John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Donald Young, of the United States, celebrates after defeating countryman John Isner in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)
Spain's Guillermo Garcia-Lopez clenches his fist after scoring during the third round match of the French Open tennis tournament against Donald Young of the U.S. at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/Darko Vojinovic)
Donald Young of the U.S. returns the ball during the third round match of the French Open tennis tournament against Spain's Guillermo Garcia-Lopez at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/Darko Vojinovic)