On this Cinco de Mayo Saturday, undefeated middleweight champion Gennady "GGG" Golovkin will be stepping into the ring, however, it just won't be against the marquee opponent that everyone was expecting. Following the performance-enhancing drama that led to Canelo Alvarez's removal from a much-anticipated rematch, GGG (37-0-1, 33 KOs) will now be facing off with Vanes Martirosyan.

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Now, one important aspect of this fight to keep in mind is that only GGG's WBA and WBO middleweight championships will be on the line. With Martirosyan (36-3-1, 21 KOs) not being recognized by the IBF as the No. 1 contender in the division, a defense of that belt is off the table.

While the scheduled fight with Canelo is not going down on Saturday as originally anticipated, all eyes will be on this fight to see whether the polarizing GGG can remain an unbeaten warrior. Should he pull off yet another win in his professional career, then given the six-month time period of Alvarez's suspension, things should be lining up for the rematch we were all waiting for this September.

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Below is all the information you need to catch the bout between GGG and Martirosyan on Saturday, and be sure to check out CBS Sports' prediction for the middleweight showdown.

Join Bloody Elbow tonight (Saturday, May 5th) for an HBO Boxing doubleheader from the StubHub Center in Carson, California. In the main event, reigning unified middleweight champion Gennady Golovkin (37-0-1, 33 KOs) takes on short-notice replacement Vanes Martirosyan (36-3-1, 21 KOs). The co-main event is historic, as world #1 pound-for-pound Cecilia Braekhus (32-0, 9 KOs) defends all four of her welterweight titles against Kali Reis (13-6-1, 4 KO), in the first ever women’s boxing match broadcast on HBO.

This obviously isn’t the fight anyone asked for, but thanks to Canelo Alvarez’s drug test failure, this is what we get. Martirosyan hasn’t fought in two years and is a pretty good junior middleweight contender, but he’s never fought at middleweight, and certainly not against someone like Golovkin. On the other hand, he’s never been stopped before, so perhaps “GGG” might find it difficult to KO the Edmond Taverdyan trained fighter.

The IBF is not sanctioning this as a title fight, so the WBC and WBA are the only major belts on the line in the night’s headliner. Golovkin is incredibly popular in Southern California, so it should be a great atmosphere at the StubHub Center.

Bloody Elbow will have live coverage of the card starting at 11 PM ET/8 PM PT, with results and highlights to follow.