Tournaments

SINGAPORE - OCTOBER 21: Simona Halep of Romania practices prior to the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 21, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images)

Simona Halep opens against Nicole Gibbs in Shenzhen

Novak Djokovic: injury concerns force withdrawal from action in Doha

Garbine Muguruza can retake No. 1 ranking in Brisbane

Serena Williams makes return to tennis in Abu Dhabi

ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 29: Andy Murray of Great Britain plays a forehand during his exhibition match against Roberto Bautista Agut of Spain on day two of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 29, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Tom Dulat/Getty Images)

Andy Murray drops one set exhibition match in Abu Dhabi

BRISBANE, AUSTRALIA - DECEMBER 29: Garbine Muguruza speaks at a press conference after walking along Streets Beach at Southbank ahead of the 2018 Brisbane International on December 29, 2017 in Brisbane, Australia. (Photo by Bradley Kanaris/Getty Images)

Garbine Muguruza enters Brisbane International as top seed

LONDON, ENGLAND - NOVEMBER 16: Alexander Zverev of Germany volleys in his Singles match against Jack Sock of the United States during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Alexander Zverev to use Hopman Cup as 2018 kickoff

LONDON, ENGLAND - JULY 12: Novak Djokovic of Serbia talks during a press conference on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2017 in London, England. (Photo by Joe Toth - AELTC Pool/Getty Images)

Novak Djokovic: delayed start to 2018 tour due to injury

PERTH, AUSTRALIA - DECEMBER 29: Roger Federer of Switzerland looks on during a practice session against Thanasi Kokkinakis of Australia, ahead of the 2018 Hopman Cup at Perth Arena on December 29, 2017 in Perth, Australia. (Photo by Will Russell/Getty Images)

Roger Federer enters 2018 tour at the top of his game

NEW YORK, NY - AUGUST 30: Eugenie Bouchard of Canada returns a shot to Evgeniya Rodina of Russia during their first round Women's Singles match on Day Three of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

Eugenie Bouchard and Vasek Pospisil set for Hopman Cup

BEIJING, CHINA - OCTOBER 02: Angelique Kerber of Germany returns a shot against Alize Cornet on day three of the 2017 China Open at the China National Tennis Centre on October 1st, 2017 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

Angelique Kerber teams up with Alexander Zverev at Hopman Cup

LONDON, ENGLAND - NOVEMBER 19: Grigor Dimitrov of Bulgaria celebrates victory following the singles final against David Goffin of Belgium during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Naomi Baker/Getty Images)

Grigor Dimitrov: can he win his first Grand Slam at Melbourne Park?

PERTH, AUSTRALIA - DECEMBER 28: Roger Federer of Switzerland takes a selfie with a Quokka at Rottnest Island ahead of the 2018 Hopman Cup on December 28, 2017 in Perth, Australia. (Photo by Paul Kane/Getty Images)

Roger Federer: defending champion arrives in Australia

LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain reacts in his Singles match against David Goffin of Belgium during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Rafael Nadal withdraws from Brisbane due to injury

NASSAU, BAHAMAS - DECEMBER 03: Rafael Nadal walks with Tiger Woods during the final round of the Hero World Challenge at Albany, Bahamas on December 3, 2017 in Nassau, Bahamas. (Photo by Mike Ehrmann/Getty Images)

Rafael Nadal: King of Clay, can he win at Melbourne Park?

LONDON, ENGLAND - NOVEMBER 16: Roger Federer of Switzerland plays a forehand in his Singles match against Marin Cilic of Croatia during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Roger Federer: Tim Henman’s pick for 2018 Australian Open

MELBOURNE, AUSTRALIA - JANUARY 28: Serena Williams of the United States walks a lap of honour with the Daphne Akhurst Trophy after winning the Women's Singles Final against Venus Williams of the United States on day 13 of the 2017 Australian Open at Melbourne Park on January 28, 2017 in Melbourne, Australia. (Photo by Cameron Spencer/Getty Images)

Serena Williams: return will shakeup 2018 WTA Tour

SINGAPORE - OCTOBER 25: Simona Halep of Romania sits with coach Darren Cahill in her singles match against Caroline Wozniacki of Denmark during day 4 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 25, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images)

Simona Halep to play Shenzhen Open before Australia

MELBOURNE, AUSTRALIA - JANUARY 28: Serena Williams of the United States poses with the Daphne Akhurst Memorial Cup after winning the 2017 Women's Singles Australian Open Championship at Melbourne Park on January 28, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

Serena Williams to play Mubadala World Tennis Championship

LONDON, ENGLAND - NOVEMBER 16: Alexander Zverev of Germany plays a forehand in his Singles match against Jack Sock of the United States during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Alexander Zverev: 2018 ATP World Tour Grand Slam title chances

LONDON, ENGLAND - NOVEMBER 16: Roger Federer of Switzerland plays a backhand in his Singles match against Marin Cilic of Croatia during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Roger Federer is on the verge of greatness in 2018

LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain plays a backhand in his Singles match against David Goffin of Belgium during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Rafael Nadal: injury remains an issue at start of 2018

LONDON, ENGLAND - NOVEMBER 11: Andy Murray of Great Britain in action watched by his coach Jamie Delgado during a training session prior to the Nitto ATP World Tour Finals at O2 Arena on November 11, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Andy Murray delays trip to Australia, plans to play Brisbane

SINGAPORE - OCTOBER 27: Simona Halep of Romania looks dejected in her singles match against Elina Svitolina of Ukraine during day 6 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 27, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images)

Simona Halep, Caroline Wozniacki to headline St. Petersburg 2018

MELBOURNE, AUSTRALIA - DECEMBER 06: Nick Kyrgios speaks to the media during an Australian Open announcement at Melbourne Park on December 6, 2017 in Melbourne, Australia. (Photo by Darrian Traynor/Getty Images)

Nick Kyrgios: no coach, optimistic for 2018 ATP World Tour

LONDON, ENGLAND - JULY 03: Stan Wawrinka of Switzerland reacts during the Gentlemen's Singles first round match against Daniil Medvedev of Russia on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2017 in London, England. (Photo by David Ramos/Getty Images)

Stan Wawrinka withdraws from Abu Dhabi, playing shape in doubt

LONDON, ENGLAND - NOVEMBER 16: Roger Federer of Switzerland celebrates victory in his Singles match against Marin Cilic of Croatia during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Naomi Baker/Getty Images)

Roger Federer: recapping 2017 AusOpen, can he defend his title?

LONDON, ENGLAND - NOVEMBER 19: Grigor Dimitrov of Bulgaria lifts the trophy as he celebrates victory following the singles final against David Goffin of Belgium during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Brisbane International: Grigor Dimitrov enters as defending champion