The brash Mercado knocked out former champ Jose Pedraza, ran his record to 17-0 (16 KOs) and then looked ringside, calling out Shakur Stevenson, the current WBC 135-pound champ.

The Next Step's A-Troupe battles heartbreak, betrayal, and the toughest competitors they've ever faced, and learn that it's not about how you fall, but how you get back up on the road to ...

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