Canelo Alvarez, Gennady Golovkin set for trilogy fight in September

Canelo Alvarez will return to super middleweight and face Gennady Golovkin in their trilogy fight on Sep. 17, promoters Matchroom Boxing said.

Alvarez, who holds all four major belts at super middleweight, stepped up to light heavyweight earlier this month but was beaten by Russian Dmitry Bivol in only the second loss of his career.

Alvarez and…