Kei Nishikori

Novak Djokovic of Serbia plays a backhand in the singles semi-final match against Kei Nishikori of Japan on day seven of the Barclays ATP World Tour Finals at O2 Arena on November 15, 2014 in London, England.  (Photo by Clive Brunskill/Getty Images)

Djokovic Beats Nishikori, Advances To ATP Finals

Two-time defending champion Novak Djokovic overcame a lapse of concentration to beat Kei Nishikori 6-1, 3-6, 6-0 and advance to a third straight final at the ATP Finals in London on Saturday.

11/15/2014

Marin Cilic of Croatia returns a shot against Kei Nishikori of Japan during the US Open men's singles final at the USTA Billie Jean King National Tennis Center on Sept. 8, 2014, in New York City. (Photo by Al Bello/Getty Images)

Cilic Leaves Little Doubt, Smashes Nishikori In US Open Final

Marin Cilic of Croatia won his first Grand Slam title by beating Kei Nishikori of Japan 6-3, 6-3, 6-3 on Monday in the U.S. Open final, a year after missing the tournament because of a doping suspension.

09/08/2014

Marin Cilic (Photo by Al Bello/Getty Images) and Kei Nishikori (Photo by Streeter Lecka/Getty Images) will face off in Monday's men's final at the US Open.

Kei Nishikori, Marin Cilic Meet In Surprising US Open Final

It’s among the most unexpected championship matchups in tennis history. Neither is currently ranked in the top 10. And neither has played in a major final, let alone won one.

09/08/2014

Novak Djokovic of Serbia returns a shot against Kei Nishikori of Japan during their men's singles semifinal match on Day Thirteen of the 2014 US Open.. (Photo by Matthew Stockman/Getty Images)

Liguori: Top Seed Novak Djokovic Sent Home Early

Kei Nishikori became the first Asian man to advance to a Grand Slam final. The 24-year-old from Japan ousted the top-ranked player in the world, Novak Djokovic, 6-4, 1-6, 7-6, 6-3.

09/06/2014

NEW YORK, NY - SEPTEMBER 06:  Kei Nishikori of Japan celebrates after defeating Novak Djokovic of Serbia in their men's singles semifinal match on Day Thirteen of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2014 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Mike Stobe/Getty Images for USTA)

Japan’s Nishikori Stuns Top-Ranked Djokovic In Four Sets At US Open

Japan’s Kei Nishikori became the first man from Asia to reach a Grand Slam final, stunning top-ranked Novak Djokovic in four sets at the U.S. Open.

09/06/2014

Roger Federer of Switzerland returns a shot against Gael Monfils of France during their men's singles quarterfinal match on Day Eleven of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

Federer Saves 2 Match Points, Reaches US Open Semis

Frustrated by Monfils’ unpredictable style, flummoxed by the swirling wind, and missing shots he normally makes, Federer twice was a single point from losing while down 5-4 in the fourth set.

09/04/2014

(Left): Serena Williams of the United States reacts against Flavia Pennetta of Italy during their women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Chris Trotman/Getty Images for USTA)

(Right): Novak Djokovic of Serbia serves against Andy Murray of Great Britain during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Julian Finney/Getty Images)

Serena Williams, Novak Djokovic Off To US Open Semifinals

After a bad-as-can-be start, dropping the first three games, Serena Williams quickly turned things around and stretched her U.S. Open winning streak to 19 matches to get back to the semifinals.

09/03/2014

Kei Nishikori of Japan celebrates after defeating Stan Wawrinka of Switzerland in their men's singles quarterfinal match on Day Ten of the 2014 US Open. (Photo by Chris Trotman/Getty Images for USTA)

Liguori: Marathon Man Kei Nishikori Continues To Make History At US Open

Tenth seed Kei Nishikori became the first Japanese player in the Open Era to advance to a Grand Slam semifinal with a five-set win over 2014 Australian Open champion Stan Wawrinka 3-6, 7-5, 7-6, 6-7, 6-4.

09/03/2014

Kei Nishikori of Japan returns a shot against Stan Wawrinka of Switzerland during the US Open quarterfinals on Sept. 3, 2014. (Photo by Elsa/Getty Images)

Japan’s Nishikori Outlasts No. 3 Wawrinka For Spot In US Open Semifinals

The match went 4 hours, 15 minutes, and the 10th-seeded Nishikori managed to shake off any lingering exhaustion from his previous victory, which lasted 4:19 and ended at 2:26 a.m. Tuesday, equaling the latest finish in tournament history.

09/03/2014

Novak Djokovic (Photo by Matthew Stockman/Getty Images) and Serena Williams (Photo by Chris Trotman/Getty Images for USTA) in action at the 2014 US Open.

Murray-Djokovic, Serena-Pennetta Highlight Busy Wednesday At US Open

Andy Murray went more than a year between victories over top-10 opponents. Now he needs to make it two in a row.

09/03/2014

Eugenie Bouchard of Canada returns a shot against Olga Govortsova of Belarus during their match at the US Open on Aug. 26, 2014. (Photo by Al Bello/Getty Images)

Wimbledon Finalist Bouchard Off And Running At US Open

Back on the Grand Slam stage, Eugenie Bouchard returned to her winning ways. The seventh-seeded Bouchard routed Olga Govortsova 6-2, 6-1 on Tuesday in the first round of the U.S. Open.

08/26/2014

Jo-Wilfried Tsonga (Photo credit should read DON EMMERT/AFP/GettyImages) and Mardy Fish (Photo by Al Bello/Getty Images)

Fifth-Seeded Jo-Wilfried Tsonga Upset; American Mardy Fish Rallies To Win In Five

This US Open finally got its first shocker. After three days of the top players winning decisively, fifth-seeded Jo-Wilfried Tsonga was upset by Martin Klizan of Slovakia in the second round.

08/30/2012