Floyd Mayweather might not be done fighting after all. The 50-0 boxer called out Manny Pacquiao last month and he is reportedly "deadly serious" about their rematch.

TMZ Sports recently caught up with Stephen Espinoza, the President of Programming for Showtime Sports, who revealed that Mayweather isn't just talking about coming out of retirement, he is for real. "Having spoken to Floyd, I know he's deadly serious about it. He's very, very serious about wanting the fight," says Espinoza.

While there has yet to be an official announcement regarding Mayweather vs Pacquaio 2, Mayweather recently told TMZ Sports, "Before the Mayweather-Pacquiao rematch, I will be back in Tokyo for a huge boxing event. Stay tuned."

Mayweather, 41, hasn't fought since last August when he came out of retirement and defeated UFC star Conor McGregor by way of TKO in the 10th round. Meanwhile, Pacquiao has gone 3-1 since losing to Mayweather in 2015, with his only loss being a controversial defeat to Jeff Horn.

The two fighters have both been teasing a rematch in recent weeks and judging from their comments, as well as recent remarks made by Stephen Espinoza, it appears a rematch is more likely than not to occur in the near future.