ATP

PRAGUE, CZECH REPUBLIC - SEPTEMBER 21: Dominic Thiem of Team Europe during practice ahead of the Laver Cup on September 21, 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 Julian Finney/Getty Images for Laver Cup)

Dominic Thiem must rebound and qualify for 2017 ATP Finals

Chengdu Open: Yūichi Sugita continuing career year

Swiss Indoors Basel will be critical point for Roger Federer

Jared Donaldson stuns British No. 2 Kyle Edmund at Chengdu Open

WINSTON-SALEM, NC - AUGUST 24: Kyle Edmund of Great Britain returns a shot to Steve Johnson during their quarterfinals match of the Winston-Salem Open at Wake Forest University on August 24, 2017 in Winston-Salem, North Carolina. (Photo by Jared C. Tilton/Getty Images)

Kyle Edmund opens in fine form at Chengdu Open

NEW YORK, NY - SEPTEMBER 02: Roberto Bautista Agut of Spain returns a shot to Juan Martin del Potro of Argentina in their third round Men's Singles match on Day Six of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

Roberto Bautista Agut making waves at St. Petersburg Open

NEW YORK, NY - AUGUST 28: Alexander Zverev Jr. of Germany reacts against Darian King of Barbados during their first round Men's Singles match on Day One of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

Alexander Zverev rises to No. 4 in ATP World Tour rankings

NEW YORK, NY - SEPTEMBER 06: Roger Federer of Switzerland returns a shot against Juan Martin del Potro of Argentina during their Men's Singles Quarterfinal match on Day Ten of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

Roger Federer, Rafael Nadal secure spots in ATP World Tour Finals

NEW YORK, NY - AUGUST 30: Sam Querrey of the United States reacts against Dudi Sela of Israel during their second round Men'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 Abbie Parr/Getty Images)

Sam Querrey: breaking down the American’s 2017 US Open run

Arthur Ashe runs for the ball during a match at Wimbledon in England.

Arthur Ashe: remembering one of the sport’s greatest champions

NEW YORK, NY - AUGUST 26: Andy Murray of Great Britian with his coach Ivan Lendl during a practice session prior to the US Open Tennis Championships at USTA Billie Jean King National Tennis Center on August 26, 2017 in New York City. (Photo by Clive Brunskill/Getty Images)

Andy Murray resting in preparation for 2018 ATP World Tour

NEW YORK, NY - SEPTEMBER 06: Juan Martin del Potro (R) of Argentina shakes hands with Roger Federer (L) of Switzerland after their Men's Singles Quarterfinal match on Day Ten of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Abbie Parr/Getty Images)

Roger Federer ousted by red hot Juan Martin del Potro

NEW YORK, NY - SEPTEMBER 05: Pablo Carreno Busta of Spain returns a shot against Diego Schwartzman of Argentina during his Men's Singles Quarterfinal match on Day Nine of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Abbie Parr/Getty Images)

US Open 2017: Pablo Carreño Busta continues breakout year

NEW YORK, NY - SEPTEMBER 03: Sam Querrey celebrates his win over Mischa Zverev of Germany on Day Seven of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

American tennis is alive and well at 2017 US Open

NEW YORK, NY - AUGUST 30: Denis Shapovalov of Canada celebrates defeating Jo-Wilfried Tsonga of France during their second round Men's Second 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 Abbie Parr/Getty Images)

US Open 2017: Denis Shapovalov makes history

NEW YORK, NY - AUGUST 29: Frances Tiafoe congratulates Roger Federer of Switzerland after their match 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 Clive Brunskill/Getty Images)

US Open 2017: Frances Tiafoe makes statement against Roger Federer

MASON, OH - AUGUST 18: Rafael Nadal of Spain celebrates after defeating Albert Ramos-Vinolas of Spain during Day 7 of the Western and Southern Open at the Linder Family Tennis Center on August 18, 2017 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

ATP World Tour: Rafael Nadal is officially the world No. 1

MASON, OH - AUGUST 19: Grigor Dimitrov of Bulgaria celebrates after defeating John Isner to advance to the finals during Day 8 of the Western and Southern Open at the Linder Family Tennis Center on August 19, 2017 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

ATP World Tour: Grigor Dimitrov achieves Top 10 ranking

MASON, OH - AUGUST 15: John Isner serves to Tommy Paul during the Western and Southern Open on August 15, 2017 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

ATP World Tour: John Isner rises to No. 14 in the world

MASON, OH - AUGUST 16: Alexander Zverev of Germany returns a shot to Frances Tiafoe during Day 5 of the Western & Southern Open at the Linder Family Tennis Center on August 16, 2017 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

Alexander Zverev can benefit from wakeup call at Cincinnati Masters

MASON, OH - AUGUST 16: Frances Tiafoe celebrates match point after defeating Alexander Zverev of Germany during Day 5 of the Western & Southern Open at the Linder Family Tennis Center on August 16, 2017 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

ATP World Tour: Frances Tiafoe secures biggest win of career

MONTREAL, QC - AUGUST 08: Jared Donaldson of the United States wipes himself down against Benoit Paire of France during day five of the Rogers Cup presented by National Bank at Uniprix Stadium on August 8, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

ATP World Tour: Jared Donaldson secures yet another Top 20 upset

ATLANTA, GA - JULY 28: Jack Sock returns a forehand to Kyle Edmund of Great Britain during the BB&T Atlanta Open at Atlantic Station on July 28, 2017 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

ATP World Tour: Three Americans ranked in the Top 20

MONTREAL, QC - AUGUST 12: Denis Shapovalov of Canada reacts after scoring a point against Alexander Zverev of Germany during day nine of the Rogers Cup presented by National Bank at Uniprix Stadium on August 12, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

Denis Shapovalov makes massive jump in ATP World Tour rankings

MONTREAL, QC - AUGUST 10: Rafael Nadal of Spain reacts after scoring a point against Denis Shapovalov of Canada during day seven of the Rogers Cup presented by National Bank at Uniprix Stadium on August 10, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

Rafael Nadal will return to No. 1 on ATP World Tour on August 21

MONTREAL, QC - AUGUST 13: Confetti is blown as Alexander Zverev of Germany makes his way onto the stage with the trophy after defeating Roger Federer of Switzerland 6-3, 6-4 in the final during day ten of the Rogers Cup presented by National Bank at Uniprix Stadium on August 13, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

ATP World Tour: Alexander Zverev is on the cusp of greatness

MONTREAL, QC - AUGUST 07: Jared Donaldson of the United States serves against Lucas Pouille of France during day four of the Rogers Cup presented by National Bank at Uniprix Stadium on August 7, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

American Jared Donaldson pulls off big upset at Coupe Rogers

LONDON, ENGLAND - JULY 16: Roger Federer of Switzerland kisses the trophy as he celebrates victory after the Gentlemen's Singles final against Marin Cilic of Croatia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 16, 2017 in London, England. (Photo by Julian Finney/Getty Images)

ATP World Tour: Happy 36th Birthday, Roger Federer!