NEWLY crowned five-time world champion Manny Pacquiao is gunning for unbeaten Floyd Mayweather Jr after his breathtaking win over Puerto Rican Miguel Cotto on Saturday night. <br /><br />The Filipino superstar, 30, stopped Cotto in the 12th round of their WBO welterweight clash in Las Vegas to claim his fifth world title at a fifth different weight.<br /><br />And although he is already assured a place in the history books, Pacquiao has his sights firmly set on a mega-fight with Mayweather to secure his status as pound-for-pound king.<br /><br />“The whole world wants to see him fight Mayweather and I want Mayweather,” said Pacquiao’s trainer Freddie Roach.<br /><br />Pacquiao added: “My job is to fight in the ring and I think that depends on Bob Arum my promoter to negotiate that fight. I’m just going to take a vacation first and spend time with my family and have fun.”<br /><br />Saturday’s stunning win took Pacquiao’s record to an impressive 50 wins, with 38 knockouts, three defeats and two draws. He proved too fast and aggressive for <br />Cotto and his relentless pressure finally told when, 55 seconds into the final round, referee Kenny Bayless stopped the contest. <br /><br />“I tried my best to knock him out. I thought in the 11th round they would stop the fight,” said Pacquiao.<br /><br />And should a showdown between Pacquiao and Mayweather take place, the American has been warned about the Filipino’s capabilities. <br /><br />“I didn’t know from where the punches were coming. Manny Pacquiao is one of the best boxers I ever fought,” said Cotto.