Mikhail Kukushkin

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Mikhail Kukushkin, of Kazakhstan, returns a shot to Nikoloz Basilashvili in a semifinal at the Memphis Open tennis tournament, Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Nikoloz Basilashvili, of Georgia, returns a shot to Mikhail Kukushkin in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Nikoloz Basilashvili, of Georgia, returns a shot to Mikhail Kukushkin in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

Mikhail Kukushkin, of Kazakhstan, sits during a changeover in his loss to Nikoloz Basilashvili, of Georgia, in a semifinal at the Memphis Open tennis tournament Saturday, Feb. 18, 2017, in Memphis, Tenn. Basilashvili defeated Kukushkin 7-6 (5), 6-1. (AP Photo/Mark Humphrey)

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Steve Johnson, of the United States, returns a shot to Mikhail Kukushkin in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Steve Johnson, of the United States, returns a shot to Mikhail Kukushkin in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Mikhail Kukushkin, of Kazakhstan, returns a shot to Steve Johnson in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Mikhail Kukushkin, of Kazakhstan, returns a shot to Steve Johnson in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Steve Johnson, of the United States, returns a shot to Mikhail Kukushkin in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Mikhail Kukushkin, of Kazakhstan, returns a shot to Steve Johnson in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Mikhail Kukushkin, of Kazakhstan, waves to fans after defeating Steve Johnson, of the United States, 6-0, 6-4, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Stanislas Wawrinka, of Switzerland, reacts after winning a break game against to Mikhail Kukushkin, of Kazakhstan, during the third single match of the tennis Davis Cup World Group quarterfinal between Switzerland and Kazakhstan, in Geneva, Switzerland, Sunday, April 6, 2014. (AP Photo/Keystone,Salvatore Di Nolfi)