I've thought about Mayweather for a long time now," Roach told ESPN.com from his Wild Card gym in Hollywood, Calif., on Monday. "He's the ultimate opponent. His style does pose some problems because he's very good at what he does. But after seeing Manny with Cotto, Manny showed he takes a punch well. We'll definitely knock Mayweather out. He'll break down. He can't stand up to Manny's pressure. He won't last as long as Cotto.Freddie Roach, already making predictions about a Pacquiao-Mayweather bout. Roach adds that Pacquiao has more balls than Mayweather.