Nishikori rolls into round of 16 at U.S. Open

Nishikori rolls into round of 16 at U.S. Open

NEW YORK, United States - Japan's Kei Nishikori expresses joy after beating Argentina's Leonardo Mayer in a U.S. Open match on Aug. 30, 2014, in New York. Nishikori beat Mayer 6-4, 6-2, 6-3 to advance to the round of 16.

Nishikori rolls into round of 16 at U.S. Open

Nishikori rolls into round of 16 at U.S. Open

NEW YORK, United States - Japan's Kei Nishikori returns a shot during a U.S. Open match against Argentina's Leonardo Mayer on Aug. 30, 2014, in New York. Nishikori beat Mayer 6-4, 6-2, 6-3 to advance to the round of 16.

Wimbledon tennis 2nd round

Wimbledon tennis 2nd round

LONDON, United Kingdom - Kei Nishikori of Japan plays against Leonardo Mayer of Argentina in a second-round men's singles match at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 27, 2013. Nishikori won 7-6(5), 6-4, 6-2.

Wimbledon tennis 2nd round

Wimbledon tennis 2nd round

LONDON, United Kingdom - Kei Nishikori of Japan plays against Leonardo Mayer of Argentina in a second-round men's singles match at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 27, 2013. Nishikori won 7-6(5), 6-4, 6-2.

Wimbledon tennis 2nd round

Wimbledon tennis 2nd round

LONDON, United Kingdom - Kei Nishikori of Japan plays against Leonardo Mayer of Argentina in a second-round men's singles match at the Wimbledon Championships at the All England Club in Wimbledon, southwest London, on June 27, 2013. Nishikori won 7-6(5), 6-4, 6-2.

Nishikori advances to quarterfinals in Washington

Nishikori advances to quarterfinals in Washington

Japan's Kei Nishikori hits a forehand in his third-round match against Leonardo Mayer of Argentina at the Citi Open in Washington on Aug. 6, 2015.. Nishikori won 6-4, 6-4 to advance to the quarterfinals. (Kyodo) ==Kyodo

Nishikori advances to quarterfinals in Washington

Nishikori advances to quarterfinals in Washington

Japan's Kei Nishikori hits a forehand in his third-round match against Leonardo Mayer of Argentina at the Citi Open in Washington on Aug. 6, 2015. Nishikori won 6-4, 6-4 to advance to the quarterfinals. (Kyodo) ==Kyodo

Nishikori advances to quarterfinals in Washington

Nishikori advances to quarterfinals in Washington

Japan's Kei Nishikori hits a forehand in his third-round match against Leonardo Mayer of Argentina at the Citi Open in Washington on Aug. 6, 2015. Nishikori won 6-4, 6-4 to advance to the quarterfinals. (Kyodo) ==Kyodo

Nishikori advances to quarterfinals in Washington

Nishikori advances to quarterfinals in Washington

Japan's Kei Nishikori hits a backhand return in his third-round match against Leonardo Mayer of Argentina at the Citi Open in Washington on Aug. 6, 2015. Nishikori won 6-4, 6-4 to advance to the quarterfinals. (Kyodo) ==Kyodo

Nishikori advances to quarterfinals in Washington

Nishikori advances to quarterfinals in Washington

Japan's Kei Nishikori waves to the crowd after defeating Leonardo Mayer of Argentina in the third round of the Citi Open in Washington on Aug. 6, 2015. Nishikori won 6-4, 6-4 to advance to the quarterfinals. (Kyodo) ==Kyodo

Nishikori rolls into round of 16 at U.S. Open

Nishikori rolls into round of 16 at U.S. Open

NEW YORK, United States - Japan's Kei Nishikori returns a shot during a U.S. Open match against Argentina's Leonardo Mayer on Aug. 30, 2014, in New York. Nishikori beat Mayer 6-4, 6-2, 6-3 to advance to the round of 16. (Kyodo)

Tennis: French Open

Tennis: French Open

Roger Federer of Switzerland celebrates after beating Argentina's Leonardo Mayer in the fourth round of the French Open tennis tournament in Paris on June 2, 2019. (Kyodo) ==Kyodo

Tennis: French Open

Tennis: French Open

Roger Federer of Switzerland plays against Argentina's Leonardo Mayer in the fourth round of the French Open tennis tournament in Paris on June 2, 2019. Federer won 6-2, 6-3, 6-3. (Kyodo) ==Kyodo

Tennis: French Open

Tennis: French Open

Roger Federer of Switzerland plays against Argentina's Leonardo Mayer in the fourth round of the French Open tennis tournament in Paris on June 2, 2019. Federer won 6-2, 6-3, 6-3. (Kyodo) ==Kyodo

Tennis: French Open

Tennis: French Open

Roger Federer of Switzerland plays against Argentina's Leonardo Mayer in the fourth round of the French Open tennis tournament in Paris on June 2, 2019. (Kyodo) ==Kyodo

Tennis: Taro Daniel

Tennis: Taro Daniel

Japan's world No. 109 Taro Daniel returns the ball against No. 47 Leonardo Mayer of Argentina in the third round of the BNP Paribas Open in Indian Wells, California, on March 13, 2018. Daniel was defeated 6-4, 6-1.(Kyodo) ==Kyodo