Opinion

LONDON, ENGLAND - NOVEMBER 19: Winner, Grigor Dimitrov of Bulgaria and runner up David Goffin of Belgium hold their trophies following the singles final 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)

David Goffin: Belgian sees career year on ATP World Tour

Novak Djokovic: if healthy, can make a run at 2018 Australian Open

Roger Federer: slight favorite to win 2018 Australian Open

Angelique Kerber: outside chance at 2018 Australian Open

SHANGHAI, CHINA - OCTOBER 15: Roger Federer of Switzerland with Rafael Nadal of Spain pose with their trophy after the Men's singles final mach on day eight of 2017 ATP Shanghai Rolex Masters at Qizhong Stadium on October 15, 2017 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

Rafael Nadal has No. 1 ranking, Roger Federer has scoreboard in 2017

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: recovery, offseason, and 2018 predictions

LONDON, ENGLAND - NOVEMBER 16: Alexander Zverev of Germany in action 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: career year earns him No. 4 ranking

LONDON, ENGLAND - NOVEMBER 18: Jack Sock of the United States waves goodbye to the crowd after his three set defeat in his semi final match by Grigor Dimitrov of Bulgaria at the Nitto ATP World Tour Finals at O2 Arena on November 18, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Jack Sock: can he top the men’s singles rankings in 2018?

MELBOURNE, AUSTRALIA - JANUARY 28: Serena Williams waves to the crowd as she leaves the court 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 Scott Barbour/Getty Images)

Serena Williams: will she be ready for the 2018 Australian Open?

SHANGHAI, CHINA - OCTOBER 12: Steve Johnson of United States returns a shot during the Men's singles mach third round against Marin Cilic of Croatia on day five of 2017 ATP Shanghai Rolex Masters at Qizhong Stadium on October 12, 2017 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

Steve Johnson: another success story for American men’s tennis

LONDON, ENGLAND - NOVEMBER 17: Dominic Thiem of Austria plays a backhand in his Singles match against David Goffin of Belgium during day six of the Nitto ATP World Tour Finals at O2 Arena on November 17, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Dominic Thiem: breaking down his 2017 ATP World Tour

LONDON, ENGLAND - JULY 12: Novak Djokovic of Serbia plays a backhand during the Gentlemen's Singles quarter final match against Tomas Berdych of The Czech Republic 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 Julian Finney/Getty Images)

Novak Djokovic eyeing return to the top of men’s singles tennis

LONDON, ENGLAND - NOVEMBER 16: Alexander Zverev of Germany celebrates a point 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 Naomi Baker/Getty Images)

Alexander Zverev completes career year on ATP World Tour

LONDON, ENGLAND - NOVEMBER 16: Jack Sock of The United States celebrates victory during the singles match against Alexander Zverev of Germany on day five of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Alex Pantling/Getty Images)

Jack Sock: biggest surprise at the 2017 ATP Finals in London

LONDON, ENGLAND - NOVEMBER 15: Grigor Dimitrov of Bulgaria celebrates during the singles match against David Goffin of Belgium on day four of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 15, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

Grigor Dimitrov: Bulgaria’s best in men’s tennis making waves

LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain leaves the court after defeat 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 Julian Finney/Getty Images)

Rafael Nadal withdraws from ATP Finals, must consider 2018 tour

LONDON, ENGLAND - NOVEMBER 10: Rafael Nadal of Spain speaks during a press conference prior to the Nitto ATP World Tour Finals at O2 Arena on November 10, 2017 in London, England. (Photo by Julian Finney/Getty Images)

Rafael Nadal: lingering injury may cause problems in London

LONDON, ENGLAND - JULY 03: Stan Wawrinka of Switzerland serves 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: his 2017 ATP World Tour in review

GLASGOW, SCOTLAND - NOVEMBER 07: Roger Federer in action during his match against Andy Murray during Andy Murray Live at The Hydro on November 7, 2017 in Glasgow, Scotland. (Photo by Mark Runnacles/Getty Images for Andy Murray Live)

Roger Federer: favorite in ATP Finals opener against Jack Sock

NEW YORK, NY - AUGUST 31: Gael Monfils of France returns a shot 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 ends 2017 season, looking ahead to next year

NEW YORK, NY - AUGUST 29: Angelique Kerber of Germany serves to Naomi Osaka of Japan on Day Two of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

Angelique Kerber: WTA Elite Trophy can setup 2018 success

SHANGHAI, CHINA - OCTOBER 10: John Isner of the United States returns a shot during the Men's singles mach against Dusan Lajovic of Serbia on day three of 2017 ATP Shanghai Rolex Masters at Qizhong Stadium on October 10, 2017 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

John Isner: breaking down the American’s 2017 ATP World Tour

SHANGHAI, CHINA - OCTOBER 15: Rafael Nadal of Spain reacts during the award ceremony after losing his Men's singles final match against Roger Federer of Switzerland on day eight of 2017 ATP Shanghai Rolex Masters at Qizhong Stadium on October 15, 2017 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

Rafael Nadal: chances of winning his first ever ATP Finals

BEIJING, CHINA - OCTOBER 04: Maria Sharapova of Russia returns a shot against Simona Halep of Romania during the Women's singles 3rd round on day five of 2017 China Open at the China National Tennis Centre on October 4, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Maria Sharapova: Tianjin title is preview of what to expect in 2018

SHANGHAI, CHINA - OCTOBER 09: Juan Martin del Potro of Argentina returns a shot against during the Men's singles mach against Nikoloz Basilashvili of Georgia on day two of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 9, 2017 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

Juan Martín del Potro: 2017 resurgence is just the beginning

TOKYO, JAPAN - OCTOBER 03: Milos Raonic of Canada plays a forehand 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: major scheduling reform needed on ATP World Tour?

PRAGUE, CZECH REPUBLIC - SEPTEMBER 24: John Isner and Jack Sock of Team World celebrate during there mens doubles match between Tomas Berdych and Marin Cilic of Team Europe on the final day of the Laver cup on September 24, 2017 in Prague, Czech Republic. The Laver Cup consists of six European players competing against their counterparts from the rest of the World. Europe will be captained by Bjorn Borg and John McEnroe will captain the Rest of the World team. The event runs from 22-24 September. (Photo by Clive Brunskill/Getty Images for Laver Cup)

John Isner: can he take down Rafael Nadal for the first time?

TORONTO, ON - AUGUST 8: Eugenie Bouchard of Canada plays a shot against Donna Vekic of Croatia during Day 4 of the Rogers Cup at Aviva Centre on August 8, 2017 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

Eugenie Bouchard continues to struggle, exits China Open early