4 Fights We Need to See After UFC on ESPN 57

Opponents Jared Cannonier and Nassourdine Imavov face offJeff Bottari/Zuffa LLC via Getty ImagesSaturday's UFC on ESPN 57 card marked the promotion's long-awaited return to Louisville, and by the time it was over, the stage was set for some big fights in the middleweight, light heavyweight, and bantamweight divisions.

The Louisville show was headlined by a clash of middleweight contenders, with France's Nassourdine Imavov looking to take a big step up the rankings against the fourth-ranked Jared Cannonier. Imavov succeeded on his mission with a fourth-round TKO, and while the referee's stoppage was the subject of immediate debate, the win made the Frenchman one of the top contenders in the…