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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 Julian Finney/Getty Images)

Rafael Nadal, Roger Federer, and Novak Djokovic Top Men’s Singles Rankings

Roger Federer Surpassed By Novak Djokovic In Career Prize Money

Novak Djokovic Favorite Over Juan Martin del Potro

Kei Nishikori Bound For 2018 US Open Semifinals

NEW YORK, NY - SEPTEMBER 04: John Isner of The United States returns the ball during the men's singles quarter-final match against Juan Martin Del Potro of Argentina on Day Nine of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

John Isner Matches Best US Open Run, Reaches Quarterfinals

NEW YORK, NY - SEPTEMBER 04: Dominic Thiem of Austria returns the ball during the men's singles quarter-final match against Rafael Nadal of Spain on Day Nine of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Pantling/Getty Images)

LIVE: Dominic Thiem and Rafael Nadal Swap Sets at US Open

NEW YORK, NY - SEPTEMBER 02: Dominic Thiem of Austria celebrates during his men's singles fourth round match against Kevin Anderson of South Africa on Day Seven of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

Dominic Thiem: Can He Win His First Ever Grand Slam?

NEW YORK, NY - SEPTEMBER 03: Novak Djokovic of Serbia returns the ball during the men's singles fourth round match against Jaoa Sousa of Portugal on Day Eight of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Novak Djokovic Closing In On Another US Open Title?

NEW YORK, NY - SEPTEMBER 01: Roger Federer of Switzerland serves the ball during his men's singles third round match against Nick Kyrgios of Australia on Day Six of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

A sharp Federer overcomes Kyrgios to sail into 4th round

NEW YORK, NY - AUGUST 30: Marin Cilic of Croatia serves during his men's singles second round match against Hubert Hurkacz of Poland on Day Four of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

Marin Cilic: is he a sleeper pick at the 2018 US Open?

TORONTO, ON - JULY 29: Stan Wawrinka of Switzerland celebrates a point against Kevin Anderson of South Africa during Day 5 of the Rogers Cup at the Aviva Centre on July 29, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)

US Open 2018: Men’s Singles First Round Upsets

TORONTO, ON - AUGUST 06: Jack Sock of the United States plays a shot against Daniil Medvedev of Russia during a 1st round match on Day 1 of the Rogers Cup at Aviva Centre on August 6, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

Jack Sock: Any US Open Success Is Positive Sign for American

MELBOURNE, AUSTRALIA - JANUARY 29: (Editors Note: Digital filters were used)Roger Federer of Switzerland poses with the Norman Brookes Challenge Cup after winning the 2018 Australian Open Men's Singles Final, at Government House on January 29, 2018 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

US Open 2018: Men’s Draw Analysis

MASON, OH - AUGUST 19: Roger Federer of Switzerland returns a shot to Novak Djokovic of Serbia in the mens final during Day 9 of the Western and Southern Open at the Lindner Family Tennis Center on August 19, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

2018 US Open Top Picks: Roger Federer

MASON, OH - AUGUST 17: Novak Djokovic of Serbia celebrates after defeating Milos Roanic of Canada during Day 7 of the Western and Southern Open at the Lindner Family Tennis Center on August 17, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

2018 US Open Top Picks: Novak Djokovic

TORONTO, ON - AUGUST 12: Rafael Nadal of Spain plays a shot against Stefanos Tsitsipas of Greece during the final match on Day 7 of the Rogers Cup at Aviva Centre on August 12, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

2018 US Open Top Picks: Rafael Nadal

TORONTO, ON - AUGUST 10: Alexander Zverev of Germany plays a shot against Stefanos Tsitsipas of Greece during a quarter final match on Day 5 of the Rogers Cup at Aviva Centre on August 10, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

How Ivan Lendl can help Zverev’s game

MASON, OH - AUGUST 19: Novak Djokovic of Serbis celebrates his win over Roger Federer of Switzerland during the men's final of the Western & Southern Open at Lindner Family Tennis Center on August 19, 2018 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

Novak Djokovic Surging Just In Time For US Open

MASON, OH - AUGUST 18: Roger Federer of Switzerland returns a shot to David Goffin of Belgium during the semifinals of the Western & Southern Open at Lindner Family Tennis Center on August 18, 2018 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

Roger Federer is the underdog amongst Nadal and Djokovic

NEW YORK, NY - SEPTEMBER 10: Rafael Nadal of Spain poses with the championship trophy during the trophy ceremony after their Men's Singles Finals match on Day Fourteen of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 10, 2017 in the Flushing neighborhood of the Queens borough of New York City. Rafael Nadal defeated Kevin Anderson in the third set with a score of 6-3, 6-3, 6-4. (Photo by Matthew Stockman/Getty Images)

US Open 2018: Top Ten Men’s Surprise Predictions

MASON, OH - AUGUST 17: Roger Federer of Switzerland celebrates returns a shot to Leonardo Mayer of Argentina during Day 7 of the Western and Southern Open at the Lindner Family Tennis Center on August 17, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

Can Federer topple David Goffin?

TORONTO, ON - AUGUST 10: Marin Cilic of Croatia reacts against Rafael Nadal of Spain during a quarter final match on Day 5 of the Rogers Cup at Aviva Centre on August 10, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

Marin Cilic: Where Will He Finish In The 2018 ATP Singles Rankings?

MASON, OH - AUGUST 17: Roger Federer of Switzerland returns a shot to Stan Wawrinka of Switzerland during Day 7 of the Western and Southern Open at the Lindner Family Tennis Center on August 17, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)

Roger Federer Continues Dominance Over Stan Wawrinka

KEY BISCAYNE, FL - MARCH 26: Jack Sock of the United States walks off after court after his three set defeat against Borna Coric of Croatia in their third round match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 26, 2018 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

Jack Sock: Can He Rescue His Nightmare Season?

INDIAN WELLS, CA - MARCH 12: Dominic Thiem of Austria plays Pablo Cuevas of Uraguay during the BNP Paribas Open at the Indian Wells Tennis Garden on March 12, 2018 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)

Dominic Thiem’s woes continue: What can he do?

TORONTO, ON - AUGUST 12: Rafael Nadal (R) of Spain with the champions trophy following his win in the final match against Stefanos Tsitsipas (L) of Greece on Day 7 of the Rogers Cup at Aviva Centre on August 12, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

What’s next for Stefanos Tsitsipas?

TORONTO, ON - AUGUST 10: Alexander Zverev of Germany plays a shot against Stefanos Tsitsipas of Greece during a quarter final match on Day 5 of the Rogers Cup at Aviva Centre on August 10, 2018 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

Arrogance unbridled: Alexander Zverev?

TORONTO, ON - JULY 29: Stan Wawrinka of Switzerland celebrates a point against Kevin Anderson of South Africa during Day 5 of the Rogers Cup at the Aviva Centre on July 29, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)

Wawrinka sets up Nadal clash after hard fought win