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ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 29: Novak Djokovic of Serbia celebartes after winning the men's final match of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 29, 2018 in Abu Dhabi, United Arab Emirates. (Photo by Francois Nel/Getty Images)

Novak Djokovic Sees Mubadala World Tennis Championship Success

Happy Birthday to former world number four Kei Nishikori

Andy Murray Believes in Himself Heading into Brisbane

ATP Tour: what it is, what it looks like, and what fans need to know

HALLE, GERMANY - JUNE 23: Roger Federer of Switzerland plays a forehand in his half final match against Denis Kudla of the United States during day six of the Gerry Weber Open at Gerry Weber Stadium on June 23, 2018 in Halle, Germany. (Photo by Thomas Starke/Getty Images)

Can Roger Federer three-peat at the Australian Open?

SHANGHAI, CHINA - OCTOBER 11: Alexander Zverev of Germany celebrates a point against Alex De Minaur of Australia during they third round of the 2018 Rolex Shanghai Masters on Day 5 at Qi Zhong Tennis Centre on October 11, 2018 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

2019 ATP Early Favorites and Players to Watch

LONDON, ENGLAND - NOVEMBER 16: Novak Djokovic of Serbia plays a serve in his third singles round robin match against Marin Cilic of Croatia during Day Six of the Nitto ATP Finals at The O2 Arena on November 16, 2018 in London, England. (Photo by Julian Finney/Getty Images)

Novak Djokovic Seeking Back To Back Career Years

BEIJING, CHINA - OCTOBER 02: Jack Sock of the United States of America smiles against ikoloz Basilashvili of Georgia during his Men's Singles first Round match of the 2018 China Open at the China National Tennis Centre on October 2, 2018 in Beijing, China. (Photo by Di Yin/Getty Images)

Can Jack Sock bounce back in men’s singles on the 2019 ATP Tour?

MONTE-CARLO, MONACO - APRIL 17: Dominic Thiem of Austria hits a backhand return during his Mens Singles match against Andrey Rublev of Russia at Monte-Carlo Sporting Club on April 17, 2018 in Monte-Carlo, Monaco. (Photo by Julian Finney/Getty Images)

Dominic Thiem Trick Shot Closes Out Preseason Training

NEW YORK, NY - SEPTEMBER 07: Rafael Nadal of Spain reacts during his men's singles semi-final match against Juan Martin del Potro of Argentina on Day Twelve of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 7, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

Rafael Nadal set for early test at Mubadala World Tennis Championship

MILAN, ITALY - NOVEMBER 10: Andrey Rublev of Russia in action against Jaume Munar of Spain in the 3rd/4th match during Day Five of the Next Gen ATP Finals at Fiera Milano Rho on November 10, 2018 in Milan, Italy. (Photo by Julian Finney/Getty Images)

Andrey Rublev and Karen Khachanov ready for 2019 ATP Tour

NEW YORK, NY - SEPTEMBER 09: Novak Djokovic of Serbia reacts during his Men's Singles final match against Juan Martin del Potro of Argentina on Day Fourteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris Trotman/Getty Images for USTA)

Why Novak Djokovic Should Win The 2019 Australian Open

LONDON, ENGLAND - NOVEMBER 14: Marin Cilic of Croatia celebrates match point during his singles round robin match against John Isner of The United States during Day Four of the Nitto ATP Finals at The O2 Arena on November 14, 2018 in London, England. (Photo by Julian Finney/Getty Images)

Can Marin Cilic win another slam beyond the US Open?

SHANGHAI, CHINA - OCTOBER 06: Roger Federer of Switzerland practise at Qi Zhong Tennis Centre on October 6, 2018 in Shanghai, China. (Photo by Kevin Lee/Getty Images)

Tennis Will See A New Roger Federer From Here On Out

MELBOURNE, AUSTRALIA - JANUARY 21: Nick Kyrgios of Australia plays a backhand against Grigor Dimitrov of Bulgaria in his fourth round match against Nick Kyrgios of Australia on day seven of the 2018 Australian Open at Melbourne Park on January 21, 2018 in Melbourne, Australia (Photo by Darrian Traynor/Getty Images)

Nick Kyrgios is training but is he ready for the 2019 ATP Tour?

LONDON, ENGLAND - NOVEMBER 18: Novak Djokovic of Serbia plays a forehand during his singles final against Alexander Zverev of Germany during Day Eight of the Nitto ATP Finals at The O2 Arena on November 18, 2018 in London, England. (Photo by Julian Finney/Getty Images)

Novak Djokovic, Simona Halep named ITF World Champions

NEW YORK, NY - SEPTEMBER 07: Rafael Nadal of Spain returns the ball during his men's singles semi-final match against Juan Martin del Potro of Argentina on Day Twelve of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 7, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jaime Lawson/Getty Images for USTA)

Rafael Nadal hits practice courts, appears ready for 2019 ATP World Tour

LONDON, ENGLAND - NOVEMBER 17: Roger Federer of Switzerland looks on in his semi finals singles match against Alexander Zverev of Germany during Day Seven of the Nitto ATP Finals at The O2 Arena on November 17, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)

Fandom 250 Rankings: Roger Federer Cracks Into Top 100

LONDON, ENGLAND - NOVEMBER 14: John Isner of The United States plays a forehand during his singles round robin match against Marin Cilic of Croatia during Day Four of the Nitto ATP Finals at The O2 Arena on November 14, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)

Is a Grand Slam singles title still possible for John Isner?

NEW YORK, NY - SEPTEMBER 07: Rafael Nadal of Spain reacts during his men's singles semi-final match against Juan Martin del Potro of Argentina on Day Twelve of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 7, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

We Need To Talk About Rafael Nadal, His Future And Health

LONDON, ENGLAND - NOVEMBER 17: Roger Federer of Switzerland plays a forehand shot in his semi finals singles match against Alexander Zverev of Germany during Day Seven of the Nitto ATP Finals at The O2 Arena on November 17, 2018 in London, England. (Photo by Justin Setterfield/Getty Images)

Roger Federer ready for ATP singles title number 100

LONDON, ENGLAND - NOVEMBER 17: Kevin Anderson of South Africa plays a backhand shot in his semi finals singles match against Novak Djokovic of Serbia during Day Seven of the Nitto ATP Finals at The O2 Arena on November 17, 2018 in London, England. (Photo by Justin Setterfield/Getty Images)

Kevin Anderson 2018 ATP World Tour Success Deserves Praise

LONDON, ENGLAND - NOVEMBER 18: Novak Djokovic of Serbia stretches for a backhand in the final against Alexander Zverev of Germany during Day Eight of the Nitto ATP Finals at The O2 Arena on November 18, 2018 in London, England. (Photo by Julian Finney/Getty Images)

Way Too Early Predictions for the 2019 Australian Open

NEW YORK, NY - AUGUST 23: Novak Djokovic of Serbia; Rafael Nadal of Spain and Roger Federer of Switzerland on stage during the ATP Heritage Celebration at The Waldorf=Astoria on August 23, 2013 in New York City. (Photo by Matthew Stockman/Getty Images)

2018 ATP World Tour Finishes With Djokovic, Nadal, Federer On Top

PARIS, FRANCE - OCTOBER 28: Rafael Nadal of Spain reacts during practice ahead of the Rolex Paris Masters on October 28, 2018 in Paris, France. (Photo by Justin Setterfield/Getty Images)

Can Rafael Nadal recover in time for the Australian Open?

LONDON, ENGLAND - NOVEMBER 16: Novak Djokovic of Serbia acknowledges the crowd after winning match point in his third singles round robin match against Marin Cilic of Croatia during Day Six of the Nitto ATP Finals at The O2 Arena on November 16, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)

Big Four Are No More: Novak Djokovic Is All That Remains

CHICAGO, IL - SEPTEMBER 22: Team World Nick Kyrgios of Australia reacts against Team Europe Roger Federer of Switzerland during their Men's Singles match on day two of the 2018 Laver Cup at the United Center on September 22, 2018 in Chicago, Illinois. (Photo by Matthew Stockman/Getty Images for The Laver Cup)

Love him or hate him, Nick Kyrgios is a top tennis player

MELBOURNE, AUSTRALIA - JANUARY 27: Caroline Wozniacki of Denmark reacts after winning championship point in her women's singles final against Simona Halep of Romania on day 13 of the 2018 Australian Open at Melbourne Park on January 27, 2018 in Melbourne, Australia. (Photo by Chris Hyde/Getty Images)

2018 Australian Open: Looking back at Roger Federer and Caroline Wozniacki