Juan Martin del Potro, Roger Federer, Serena and Venus Williams reunite at F1 Miami Grand Prix

TENNIS CHANNEL LIVE: Del Potro first teased a 2023 comeback at the end of March.

Reunited and it feels so good: Juan Martin del Potro and Roger Federer were spotted together on Sunday at the Miami Grand Prix.

The two one-time rivals shared a warm embrace and a friendly chat amongst the throng of fans at Hard Rock Stadium to watch the Formula One race, which has been held on a temporary track around the stadium since last year.

Del Potro and Federer played 25 times in their careers, with the Swiss scoring 18 victories. Famous playing for the US Open title in 2009, the pair also faced off in the third round at the Miami Open in 2017 at the event's former home, Key Biscayne. (Federer won that one in straight sets on his way to winning the title.)

But in addition to their intertwining tennis careers, the two men have something else in common: They're both noted F1 fans.

Last year, Federer met the Mercedes team at the Spanish Grand Prix, while del Potro, who lives in Miami part-time, also attended the first edition of the race at Hard Rock Stadium last year.

No words were needed for Federer's second iconic meeting at the track. The 20-time Grand Slam singles champion was later spotted with Serena and Venus Williams, for a total of 50 Grand Slam singles titles in a single photo.

Serena and Federer are making hanging out a habit: Federer was a co-host for the famous Met Gala in New York City on Monday, where Serena announced she's pregnant with her second child.

Federer isn't the only major-winner with whom del Potro's been recently reunited. This week, Gabriela Sabatini posted a photo of the two together on a tennis court, sparking further rumors that del Potro's dream of playing one last US Open could be edging closer to a reality.