Unified middleweight world champion Gennady Golovkin and Canelo Alvarez worked out an agreement yesterday for their much-anticipated rematch on Sept. 15 at T-Mobile Arena in Las Vegas. Two hours after the Golden Boy Promotions-imposed noon deadline for Golovkin to accept an improved offer under which Alvarez would get the lion’s share of a 57½-42½ revenue split came and went, and with Golden Boy CEO Oscar De La Hoya telling ESPN “there is no fight,” the sides came up with a last-ditch idea that convinced GGG to accept the terms. “I’m happy to inform that we have a fight September 15!!!!,” De La Hoya tweeted.