Watch Gennady Golovkin vs. Matthew Macklin Live on HBO

On HBO Boxing After Dark, the hottest middleweight in boxing, Gennady Golovkin will headline a triple header boxing event from the Foxwoods Resort in Mashantucket, Connecticut.

The undefeated Golovkin (26-0, 23 KOs) currently holds the WBA middleweight championship belt and is considered the number two 160-pounder in the world right behind the current WBC champion Sergio Martinez. What makes Golovkin so special is his ability to pressure an opponent intelligently without getting careless and finishing them off when he sees the opportunity, he also has a decorated amateur boxing background. His opponent will be the tough Irish boxer Matthew Macklin (29-4, 20 KOs) who is best known for putting up a valiant effort in a loss to Sergio Martinez.

On the undercard of Golovkin vs. Macklin, two undefeated super-middleweights Thomas Oosthuizen (21-0-1, 13 KOs) and Brandon Gonzales (17-0, 10 KOs) will square off in the ring, and Willie Nelson (20-1-1, 12 KOs) will take on Luciano Cuello (32-2, 16 KOs) in a light middleweight match.

Watch HBO Boxing After Dark: Gennady Golovkin vs. Matthew Macklin, Thomas Oosthuizen vs. Brandon Gonzalez, and Willie Nelson vs. Luciano Cuello Saturday June 29 at 9:45 PM ET/PT live on HBO.