Although Canelo Alvarez, who is moving up two weight divisions to 175 pounds, did not seek a catch weight for his light heavyweight world title challenge of Sergey Kovalev in an effort to drain him from his natural fighting weight, there is a rehydration clause in the contract, sources told ESPN. It requires both fighters to submit to a weight check on Saturday morning at which neither man can weigh more than 185 pounds, one source said. There are severe financial penalties if either man is over. Kovalev is used to weight checks on the morning of the fight from his days of holding the IBF title because that organization requires them.