So Cotto was obviously a tougher fight. Who else was tougher? Clottey, Margarito, Bradley, Rios, an uncaged Algieri, or Mosley ... surely not JMM since they'd already fought him twice?
http://www.cbssports.com/general/eye-on-sports/25150510/et-watch-pacquiaos-live-training-session-from-los-angeles