Gennady Golovkin is listed as the early betting favorite for his September 15 rematch with Canelo Alvarez, with Bovada opening with Golovkin at -190 and Alvarez at +155.

The two fought to a highly disputed draw last September, with it seeming as though the majority of observers favored Golovkin in the bout.

But Golovkin (38-0-1, 34 KO) is 36, significantly older than Alvarez (49-1-2, 34 KO), who will turn 28 on July 18, and there is some feeling that the effort he gave the first time around is probably the best he can do against Canelo, while the younger fighter may have room to improve upon his outing.

Golovkin is coming off of a second round wipeout of Vanes Martirosyan on May 5, when he and Alvarez were originally supposed to meet for a second time, before Canelo failed anti-doping tests and pulled himself from the fight, prior to being suspended by the Nevada State Athletic Commission.

Alvarez hasn’t fought since the draw with Golovkin, and will have been out of the ring a full year by the time the rematch rolls around.