Opinion

ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 28: Andy Murray of Great Britain practice during the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 28, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Francois Nel/Getty Images)

Andy Murray withdraws from Brisbane, 2018 tour in doubt

Roger Federer rings in 2018 at Hopman Cup in Perth

Garbine Muguruza enters Brisbane International as top seed

Alexander Zverev to use Hopman Cup as 2018 kickoff

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

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?

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

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 - 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?

TOKYO, JAPAN - OCTOBER 03: Milos Raonic plays a backhand against Viktor Troicki of Serbia during day two of the Rakuten Open at Ariake Coliseum on October 3, 2017 in Tokyo, Japan. (Photo by Matt Roberts/Getty Images)

Milos Raonic: Grand Slam title search is alive and well

LONDON, ENGLAND - NOVEMBER 11: Andy Murray of Great Britain in action 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: 2018 will be career defining year on ATP World Tour

BELGRADE, SERBIA - JULY 26: Novak Djokovic speaks to the media during the press conference at Novak Tennis Center on July 26, 2017 in Belgrade, Serbia. Twelve-time Grand Slam champion Djokovic has said he will not play again in 2017 because of an elbow injury. (Photo by Srdjan Stevanovic/Getty Images)

Australian Open: Novak Djokovic’s chances at 2018 title

NEW YORK, NY - AUGUST 31: Gael Monfils of France reacts against Donald Young of the United States during their second round Men's Singles match on Day Four of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)

Gael Monfils: 2018 Australian Open is first shot at Grand Slam

LONDON, ENGLAND - NOVEMBER 14: Alexander Zverev of Germany celebrates during the singles match against Roger Federer of Switzerland on day three of the Nitto ATP World Tour Finals at O2 Arena on November 14, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Alexander Zverev: 2017’s best young player in men’s tennis

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: coaching change attempt to regain No. 1 ranking

LONDON, ENGLAND - NOVEMBER 16: Roger Federer of Switzerland walks out on court for his third and final round robin match against Marin Cilic of Croatia during the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Roger Federer: Swiss great is 2017’s best in men’s singles tennis

NEW YORK, NY - AUGUST 28: Johanna Konta of Great Britain returns a shot during her first round Women's Singles match against Aleksandra Krunic of Serbia

Johanna Konta eyes 2018 WTA Tour run with coaching change

NEW YORK, NY - SEPTEMBER 01: Mischa Zverev of Germany celebrates after defeating John Isner of the United States during their third round match on Day Five of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Steven Ryan/Getty Images)

Mischa Zverev looks to repeat stellar 2017 Australian Open run

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)

Grigor Dimitrov dominates rivalry with David Goffin

LONDON, ENGLAND - JULY 05: Novak Djokovic of Serbia and Radek Stepanek during a practice session on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 5, 2014 in London, England. (Photo by Jan Kruger/Getty Images)

Radek Stepanek joins team Djokovic, Nole set for 2018 run

SINGAPORE - OCTOBER 30: Champion Caroline Wozniacki of Denmark poses with the Billie Jean King trophy after her victory against Venus Williams of the United States in the final of the BNP Paribas WTA Finals Singapore presented by SC Global at Clifford Pier on October 30, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images)

Caroline Wozniacki: 2018 could include first Grand Slam title

BEIJING, CHINA - OCTOBER 08: Nick Kyrgios of Australia enters the tennis court during the Men's Singles final against Rafael Nadal of Spain on day nine of the 2017 China Open at the China National Tennis Centre on October 8, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Nick Kyrgios: which version will show up for 2018 ATP World Tour?

PARIS, FRANCE - NOVEMBER 01: Lucas Pouille of France celebrates victory against Feliciano Lopez of Spain during Day 3 of the Rolex Paris Masters held at the AccorHotels Arena on November 1, 2017 in Paris, France. (Photo by Dean Mouhtaropoulos/Getty Images)

Lucas Pouille poised to rise in 2018 ATP singles rankings