Boxer Manny Pacquiao’s long-awaited bout against undefeated Floyd Mayweather Jr. isn’t a sure thing just yet, but the 36-year-old already seems to like his chances. Pacquiao took to Twitter on Tuesday to boast that he would defeat Mayweather and to urge his rival to officially agree to terms on the fight.

“I can easily beat [Floyd Mayweather], I believe that,” Pacquiao wrote on his Twitter account, along with a message to Mayweather himself. “If you really care about the fans, you will fight. If you care about yourself … you won’t fight.”

Pacquiao went on to compare his chances in a potential fight against Mayweather to his 2008 match against legendary boxer Oscar De La Hoya, whom he defeated by technical knockout despite the predictions of many boxing analysts. “Everyone had me as a big underdog to [De La Hoya] too. If [Floyd Mayweather] fights me boxing will get an even bigger upset victory,” Pacquiao wrote.

Pacquiao’s camp confirmed earlier this month that he had agreed to terms on a May 2 fight against Mayweather. Under the deal, Pacquiao will receive a 40 percent cut of revenue from the match. Negotiations between the two sides confirmed the fight would take place at the MGM Grand Garden Arena in Las Vegas, Yahoo Sports reported.

However, Mayweather has yet to personally sign off on the bout, which is expected to produce the richest return in boxing history. Pacquiao said Monday that he will give Mayweather until the end of the month to approve the deal before he moves on to find a new opponent for his next match.

“My promoter and I, we’ve already agreed to the terms and conditions of whatever he wants. We’re just waiting on the signed contract from him,” Pacquiao told the Los Angeles Times. “That’s the hard part -- if they will fight or not. We have to know soon, because if they will not fight, we can move on and choose another opponent. We have a deadline … this month.”

Mayweather and Pacquiao’s camps have pursued a match for years, though disagreements on revenue splits and pre-fight drug testing derailed negotiations on several occasions. In the meantime, the rivals have traded blows on social media.