Japan's Ito beaten in Australian Open

Japan's Ito beaten in Australian Open

MELBOURNE, Australia - Tatsuma Ito of Japan returns a shot during a first-round match against Martin Klizan of Slovakia at the Australian Open tennis championships in Melbourne on Jan. 19, 2015. Klizan won 7-6, 6-2, 6-4.

Japan's Ito beaten in Australian Open

Japan's Ito beaten in Australian Open

MELBOURNE, Australia - Tatsuma Ito of Japan returns a shot during a first-round match against Martin Klizan of Slovakia at the Australian Open tennis championships in Melbourne on Jan. 19, 2015. Klizan won 7-6, 6-2, 6-4.

Wimbledon tennis men's 1st round

Wimbledon tennis men's 1st round

LONDON, United Kingdom - Rafael Nadal of Spain reacts after winning a point during a first-round men's singles match against Martin Klizan of Slovakia at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 24, 2014. Nadal won 4-6, 6-3, 6-3, 6-3.

Wimbledon tennis men's 1st round

Wimbledon tennis men's 1st round

LONDON, United Kingdom - Rafael Nadal of Spain plays against Martin Klizan of Slovakia in a first-round men's singles match at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 24, 2014. Nadal won 4-6, 6-3, 6-3, 6-3.

Wimbledon tennis men's 1st round

Wimbledon tennis men's 1st round

LONDON, United Kingdom - Rafael Nadal of Spain returns a shot during a first-round men's singles match against Martin Klizan of Slovakia at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 24, 2014. Nadal won 4-6, 6-3, 6-3, 6-3.

Cilic at U.S. Open

Cilic at U.S. Open

NEW YORK, United States - Croatia's Marin Cilic plays against Martin Klizan of Slovakia during a fourth-round men's singles match at the U.S. Open Tennis Championships in New York on Sept. 3, 2012. Cilic won to advance to the quarterfinals.

Cilic at U.S. Open

Cilic at U.S. Open

NEW YORK, United States - Croatia's Marin Cilic plays against Martin Klizan of Slovakia during a fourth-round men's singles match at the U.S. Open Tennis Championships in New York on Sept. 3, 2012. Cilic won to advance to the quarterfinals.

Japan's Nishikori plays at Barcelona open's semifinals

Japan's Nishikori plays at Barcelona open's semifinals

Kei Nishikori of Japan returns a backhand shot to Martin Klizan of Slovakia during their semifinals match at the Barcelona open tennis tournament in Barcelona, Spain, on April 25, 2015. (Kyodo) ==Kyodo

Japan's Nishikori plays at Barcelona open's semifinals

Japan's Nishikori plays at Barcelona open's semifinals

Kei Nishikori of Japan returns the ball to Martin Klizan of Slovakia during their semifinals match at the Barcelona open tennis tournament in Barcelona, Spain, on April 25, 2015. (Kyodo) ==Kyodo

Nishikori reaches 2nd straight Barcelona final

Nishikori reaches 2nd straight Barcelona final

Japan's Kei Nishikori celebrates after beating Slovakia's Martin Klizan 6-1, 6-2 in the semifinals of the Barcelona Open tennis tournament in the Spanish city on April 25, 2015. Nishikori advanced to his second straight final of the tournament. (Kyodo) ==Kyodo

Nishikori reaches 2nd straight Barcelona final

Nishikori reaches 2nd straight Barcelona final

Japan's Kei Nishikori plays Slovakia's Martin Klizan in the semifinals of the Barcelona Open tennis tournament in the Spanish city on April 25, 2015. Nishikori advanced to his second straight final of the tournament after beating Klizan 6-1, 6-2. (Kyodo) ==Kyodo

Nishikori reaches 2nd straight Barcelona final

Nishikori reaches 2nd straight Barcelona final

Japan's Kei Nishikori plays Slovakia's Martin Klizan in the semifinals of the Barcelona Open tennis tournament in the Spanish city on April 25, 2015. Nishikori advanced to his second straight final of the tournament after beating Klizan 6-1, 6-2. (Kyodo) ==Kyodo

Japan's Ito beaten in Australian Open

Japan's Ito beaten in Australian Open

MELBOURNE, Australia - Tatsuma Ito of Japan returns a shot during a first-round match against Martin Klizan of Slovakia at the Australian Open tennis championships in Melbourne on Jan. 19, 2015. Klizan won 7-6, 6-2, 6-4. (Kyodo)

Wimbledon tennis men's 1st round

Wimbledon tennis men's 1st round

LONDON, United Kingdom - Rafael Nadal of Spain returns a shot during a first-round men's singles match against Martin Klizan of Slovakia at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 24, 2014. Nadal won 4-6, 6-3, 6-3, 6-3. (Kyodo)

Djokovic advances to Wimbledon 2nd round

Djokovic advances to Wimbledon 2nd round

Novak Djokovic of Serbia beats Martin Klizan of Slovakia in the first round of the Wimbledon tennis championships on July 4, 2017, advancing to the second round. (Kyodo) ==Kyodo

Tennis: Murray moves into French Open 3rd round

Tennis: Murray moves into French Open 3rd round

Andy Murray of Britain pumps his fist after defeating Martin Klizan of Slovakia 6-7(3), 6-2, 6-2, 7-6(3) in their French Open second-round match in Paris on June 1, 2017. (Kyodo) ==Kyodo

Tennis: Murray moves into French Open 3rd round

Tennis: Murray moves into French Open 3rd round

Andy Murray of Britain plays against Martin Klizan of Slovakia during their French Open second-round match in Paris on June 1, 2017. Murray won 6-7(3), 6-2, 6-2, 7-6(3). (Kyodo) ==Kyodo

Tennis: Wawrinka survives 1st-round scare

Tennis: Wawrinka survives 1st-round scare

Stan Wawrinka of Switzerland hits a backhand to Martin Klizan of Slovakia in the first round of the Australian Open in Melbourne on Jan. 16, 2017. Wawrinka won 4-6, 6-4, 7-5, 4-6, 6-4. (Kyodo) ==Kyodo

Tennis: Wawrinka survives 1st-round scare

Tennis: Wawrinka survives 1st-round scare

Stan Wawrinka of Switzerland reacts after a five-set victory over Martin Klizan of Slovakia in the first round of the Australian Open in Melbourne on Jan. 16, 2017. Wawrinka won 4-6, 6-4, 7-5, 4-6, 6-4. (Kyodo) ==Kyodo