Before the most decorated Laver Cup field takes the court on Friday, the legendary quartet hit The O2 for one  unforgettable practice session.

Nothing beats good company, as evidenced by the scene Wednesday night for the event's "iconic" photo op.

The game’s greatest rivals found themselves on the same side of the court for the inaugural team competition at the O2 Arena in Prague.

The 20-time Grand Slam champion also recalled his practice session with Alcaraz at Wimbledon—and why it was memorable for more than just a chance to get an early look at the future world No. 1.

A gallery commemorating one of the sport's most beloved pairings on and off the court.