Alexander Zverev and his team celebrate the German's successful Citi Open title defence in Washington, D.C.

Alexander Zverev becomes the first player to retain their title at the Citi Open since Juan Martin del Potro in 2008-09.

Jamie Murray and Bruno Soares claim their second ATP World Tour title of the season, beating Mike Bryan and Edouard Roger-Vasselin at the Citi Open.

Aussie Alex de Minaur has now won 18 of his past 23 matches at all levels after defeating fellow #NextGenATP star Andrey Rublev at the Citi Open on Saturday.

#NextGenATP Greek Stefanos Tsitsipas fell short of reaching his second ATP World Tour final, losing in the Citi Open semi-finals against Alexander Zverev.

Edouard Roger-Vasselin and Mike Bryan, competing together for the first time, advance to the Citi Open final.

Alexander Zverev will try to retain his second title of the season (also Munich) on Sunday after defeating Stefanos Tsitsipas to reach the Citi Open final.

#NextGenATP Russian Andrey Rublev advances to the semi-finals at the Citi Open, continuing his pursuit of a second ATP World Tour title (2017 Umag).

Alexander Zverev beats Kei Nishikori at the Citi Open for the second year in a row, advancing to the semi-finals in Washington, D.C.

Andy Murray reaches the quarter-finals of the Citi Open early Friday morning in Washington, D.C.

#NextGenATP Aussie Alex de Minaur reaches the quarter-finals of an ATP World Tour 500-level event for the first time, beating Hyeon Chung.

Alexander Zverev and Mischa Zverev upset top seeds Oliver Marach and Mate Pavic in Washington, D.C. on Thursday right after playing one another in singles.

Kei Nishikori evens his FedEx ATP Head2Head series with #NextGenATP Denis Shapovalov at 1-1 on Thursday in Washington, D.C.

#NextGenATP Greek Stefanos Tsitsipas reaches his sixth ATP World Tour quarter-final of the season by defeating Aussie James Duckworth.

Alexander Zverev and Mischa Zverev embrace after their first tour-level meeting on Thursday at the CIti Open in Washington, D.C.

Mischa Zverev and Alexander Zverev are playing for the first time in a main-draw match on the ATP World Tour, with younger brother Alexander leading by a set.

Kei Nishikori claims his seventh win from as many FedEx ATP Head2Head meetings with Donald Young in Washington, D.C.

Andy Murray breaks Kyle Edmund twice and advances to the third round of the Citi Open on Wednesday.

Mischa Zverev will meet his brother Alexander Zverev in the third round of the Citi Open in Washington, D.C.

Denis Shapovalov rebounds from 1-4 down in the third set to beat Daniil Medvedev in the Citi Open second round.

Andy Murray improves to 3-2 in his comeback tour at the Citi Open in Washington, D.C.

Alexander Zverev looks to repeat as champion this week at the Citi Open.

Stan Wawrinka returns to the Citi Open in Washington, D.C. for the first time since 2010.

Andy Murray earns his second victory of the 2018 season, defeating Mackenzie McDonald as he continues his comeback from hip surgery.

Alexander Zverev, the top seed at the Citi Open, has never failed to advance to at least the quarter-finals in Washington, D.C.

Andy Murray will begin his campaign at the Citi Open against home favourite Mackenzie McDonald

Andy Murray complimented the forehand of D.C. United's Wayne Rooney, adding that, "he did alright for someone who doesn't play much".

Jamie Murray and Andy Murray play Wayne Rooney and Andy's fitness coach, Matt Little, in a game of football-tennis before the start of the Citi Open.

Wayne Rooney visited SW19 for the first time in 2013, watching Andy Murray capture his first Wimbledon title.

Wayne Rooney, who met fellow British star Andy Murray on Friday at the Citi Open, currently plays for D.C. United of Major League Soccer.

Football legend Wayne Rooney and Andy Murray meet for the first time on the grounds of the Citi Open.