Gennady Golovkin with his hardware collection.

On Saturday night at the StubHub Center in Carson CA, undefeated and unified middleweight titleholder Gennady “GGG” Golovkin (38-0-1, 34 KO’s) was able to start a new knockout streak, as he stopped former title challenger Vanes “The Nightmare” Martirosyan (36-3,21 KO’s) in the second round.

The card was originally scheduled for HBO PPV but was later moved to a traditional HBO card after Canelo Alvarez, who was scheduled to meet GGG in a highly anticipated rematch, withdrew from the fight after testing positive for Clenbuterol. The Nevada State Athletic Commission has suspended the Alvarez for six months.

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Golovkin, 36, who has not fought since his highly controversial draw last September against Mexican superstar Canelo Alvarez, wasted no time against the overmatched Martirosyan who had not fought in 966 days.

After a slow start, working behind their jabs, both were able to land some clean combinations and seemed to stun one another on occasion in the opening round.

In round two, Golovkin who is currently the longest reigning belt-holder in boxing, turned up the pressure, landing a huge right and uppercut that badly hurt the overmatched Martirosyan. The California native seemed to recover as he continued to use his jab and tried to box the aggressor from Kazakhstan, until he ate another big right hand and a hard uppercut that pushed him back to the ropes. After a barrage of punches, the challenger took a knee and was counted out by referee Jack Reiss.

After the fight, Golovkin said he wants everybody. When asked about a rematch with Canelo, “Absolutely, if he is ready, I am ready anytime.”