Photos: Gennady Golovkin vs. David Lemieux

Gennady Golovkin, right, lands a right against David Lemieux during their middleweight title unification bout at Madison Square Garden.

Gennady Golovkin, left, exchanges punches with David Lemieux during their middleweight title unification bout on Saturday night.

Gennady Golovkin lands a left jab against David Lemieux during their middleweight title unification bout at Madison Square Garden.

Gennady Golovkin works on David Lemieux against the ropes in their middleweight title unification fight Saturday.

David Lemieux is tended to by his handlers in between rounds of his middleweight title fight against Gennady Golovkin.

Gennady Golovkin staggers David Lemieux with a left to the head in the eighth round of their middleweight title unification fight at Madison Square Garden in New York on Saturday.

Gennady Golovkin knocks David Lemieux into the ropes in the eighth round of their middleweight title unification fight at Madison Square Garden.

Gennady Golovkin takes a bow after defeating David Lemieux by technical knockout in the eighth round of their middleweight title unification bout Saturday.

Gennady Golovkin celebrates his victory in the middleweight title unification fight with his handlers at Madison Square Garden.

Roman Gonzalez lands a left punch to the face of Brian Viloria in the eighth round of their WBC flyweight title bout at Madison Square Garden in New York on Saturday.

Brian Viloria lands a glancing blow to the head of Roman Gonzalez during their WBC flyweight championship fight.

Roman Gonzalez sends Brian Viloria reeling during their flyweight title bout in New York.

Referee Benjy Estevez stops the WBC flyweight title fight in the ninth round and declares Roman Gonzalez, right, the winner by technical knockout over Brian Viloria on Saturday night.