Former WBO welterweight champion Jeff Horn is the latest boxer to challenge Manny Pacquiao.
Horn (18-1-1, 12 KOs), captured the WBO title in July 2017, with a controversial twelve round unanimous decision over Pacquiao at the Suncorp Stadium in Brisbane, Australia.
Horn would then make a voluntary defense with a TKO victory over Gary Corcoran in the fall of last year.
Pacquiao and Horn were actually scheduled to have a rematch at the end of last year.
The Filipino star exercised his immediate rematch clause, but then he withdrew from the bout after citing scheduling conflicts with his job as a senator in the Philippines. And that led to Pacquiao being replaced with Corcoran.
Horn was in action last month, when he was dominated and stopped in nine rounds by mandatory challenger Terence Crawford at the MGM Grand in Las Vegas.
And Pacquiao had been inactive since the loss to Horn - until last night.
Pacquiao returned to the ring in Malaysia, and he secured his first stoppage win since 2009 with a seventh round knockout of Lucas Matthysse to capture the WBA "regular" welterweight title.
Following that big win, Horn took to social media and called for a rematch.
"Congratulations Manny Pacquiao. Rematch?," Horn stated.
After Horn lost the WBO title last month, he named Pacquiao as a potential opponent for the future - but had doubts that he would ever get the opportunity.
Pacquiao has numerous opportunities beyond a Horn rematch.
And the fight that most fans are discussing is a potential catch-weight bout with WBA lightweight champion Vasyl Lomachenko, who would have to move up to at least the junior welterweight limit of 140-pounds.
Lomachenko is currently recovering from shoulder surgery in the aftermath of his May knockout of Jorge Linares, and he's expected to return to the ring on a date in November or December.