Question: What was the title held in 2015 by Gennady Golovkin's opponent in the boxing match on HBO pay-per-view at Madison Square Garden on October 17, 2015?
Sentence (from "David Lemieux (boxer)"): David Lemieux (born December 22, 1988) is a Canadian professional boxer who held the IBF middleweight title in 2015.
Relevant evidence: Yes