During their 21 seasons on the ATP tour, Bob and Mike Bryan have dominated the field, claiming 16 majors and 118 total titles. But like any story, there's a beginning and an end. In November, the twins shared with Tennis Channel that they will be retiring following this year's US Open.

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Last month, they announced they would return for one last Davis Cup tie. The duo last played together in the team event in 2016, where they lost in four sets against Croatia's Ivan Dodig and Marin Cilic, and effectively retired from Davis Cup action.

This week in Honolulu the Bryans are preparing for their match against Uzbekistan. As always, they are looking seamlessly in sync.

They aren't the only ones preparing, teammates Taylor Fritz, Reilly Opelka and Tommy Paul joined in the training sessions along with captain Mardy Fish.

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"Did anyone get that on video," said Fish, after hitting a tight-angled drop shot to win a point against Paul.

The two-day Davis Cup tie begins on Thursday, with the winner qualifying for the Davis Cup Finals in Madrid in November.