Sergio Martínez vs. Sergiy Dzindziruk, billed as The Threat Is Real.was a professional boxing match contested on March 12, 2011, for The Ring middleweight championship.

[1] Having stripped by the WBC after HBO declined to broadcast a bout between him and "Interim" champion Sebastian Zbik,[2] Sergio Martínez defended his Lineal and Ring titles on the line against WBO 154 champion, Sergiy Dzindziruk.

In Round 5, Dzinziruk was knocked down again by a left hand just seconds before the bell rang.

Referee Arthur Mercante Jr. stopped the bout at the eighth after Martínez of Oxnard, California, sent Dzinziruk down for the third time.

[3][4] Martínez would next Darren Barker, after new WBC champ Julio Cesar Chavez Jr., Daniel Geale, Miguel Cotto, Andy Lee and Paul Williams, all refused to fight him.