CARSON — On a cool, crisp Southern California night, Vanes Martirosyan walked out to the ring and took center stage for the biggest bout of his career.

Four minutes and 53 seconds later, the cold reality of the conclusion many predicted came to fruition as Glendale’s Martirosyan was knocked out by Gennady “GGG” Golovkin at 1:53 of the second round in the main event of Saturday’s card at the StubHub Center and live on HBO for the World Boxing Council and World Boxing Assn. middleweight titles.

The 36-year-old Golovkin (37-0-1, 34 knockouts), a huge favorite, tied Bernard Hopkins for the longest streak of title defenses in the middleweight division with 20 as he continued his run as the longest-reigning champion in boxing, stopping Martirosyan with a savage flurry, the most telling blow likely a left hook.

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