Two of Floyd Mayweather's past opponents came together on Monday.

Social media star Logan Paul paid a surprise visit to eight division world champion Manny Pacquiao, at the Wild Card Boxing Club in Hollywood, California.

Pacquiao is preparing with his Hall of Fame coach, Freddie Roach, for the upcoming pay-per-view showdown with WBC, IBF, welterweight champion Errol Spence - which takes place on August 21 at the T-Mobile Arena in Las Vegas. 

"Honored to have Logan Paul come by Wild Card today. After watching me work out he said he was glad he fought Mayweather instead of me," Pacquiao stated.

Last month, the 26-year-old Paul - with only a single pro fight on his record - stepped in the ring with Mayweather, 44, for an exhibition fight on pay-per-view.

Most observers expected an early ending, but Paul was able to last the entire eight round distance. However, he held a significant advantage in size and strength - as he towered over Mayweather and held at least a 40-pound edge in weight.

Pacquiao, 42, lost a twelve round unanimous decision to Mayweather in 2015 - in what is still the most financially lucrative pay-per-view in history. The fight holds a solid pay-per-view buyrate record, with 4.6 million buys and over $410 million in revenue. A rematch was discussed on a few occasions, but it was never close to becoming an actual reality.