Boxer Manny Pacquiao once again challenged undefeated rival Floyd Mayweather to agree to a long-awaited and much-delayed match. The 35-year-old Filipino great took to Twitter on Tuesday to fire the latest salvo in the pair’s very public war of words.

“[Floyd Mayweather], don’t be a boxing humbug. Let’s give the fans the fight they want. They have waited long enough,” Pacquiao wrote on Twitter. The tweet quickly received more than 18,000 retweets and more than 10,000 favorites.

Hours earlier, Pacquiao said Mayweather was running out of options and would soon have no choice but to agree to fight him. “[Mayweather] has reached a dead end. He had nowhere to run but to fight me. … You all know his fighting style. Most of his previous fights, if not all, induces us to sleep,” Pacquiao said, according to the Detroit Free Press.

Mayweather addressed rumors of a potential bout with Pacquiao on Friday during an interview with Showtime Boxing. He expressed interest in fighting Pacquiao in 2015 if agreements could be reached on pre-fight drug testing and division of the match’s purse. The 37-year-old also rejected Pacquiao’s accusation that he was avoiding the clash, instead placing the onus on longtime Pacquiao promoter Bob Arum.

“Floyd Mayweather is not ducking or dodging any opponent. Bob Arum is stopping the fight. We have been trying to make this fight happen for years now behind the scenes. The fans and the people have been fooled, because they have been listening to people on one side,” Mayweather said.

The two camps nearly reached a fight agreement in 2010, but negotiations fell apart. Drug testing remains an issue, but Mayweather and Pacquiao’s advisers are now clashing over which pay-per-view service will carry the fight and how much money each fighter will receive.

A source close to Mayweather said he wouldn't fight Pacquiao for less than two-thirds of the fight’s purse, Sports Illustrated’s Chris Mannix reported. Arum later said that report was “not accurate,” but declined to discuss specifics.