In his book "The Closer," Rivera, the legendary closer who retired after last season, take a shot at Cano, his former teammate who is currently playing for Seattle:
"This guy has so much talent I don’t know where to start. There is no doubt that he is a Hall-of-Fame caliber player. It’s just a question of whether he finds the drive you need to get there. I don’t think Robby burns to be the best. You don’t see that red-hot passion in him that you see in most elite players.”
So, basically what he is saying is "Yeah, Cano is a good player, but he has no desire."
Not a good thing to say about a former teammate. In fact, when asked to pick his favorite second baseman, Rivera turns to the arch-rival Boston Red Sox:
"Dustin Pedroia is at the top of the list. Nobody plays harder, gives more, wants to win more. He comes at you hard for twenty-seven outs. It’s a special thing to see.”