ESPN MMA's Hot Button: Who is Edgar's Toughest Test?

Every week inside ESPN.com's MMA section, two scribes debate the most pressing issues in the sport in the Hot Button.

This week, Sherdog.com Administrative Editor Jordan Breen and ESPN.com's Chuck Mindenhall debate which 155-pounder has the best chance of ending Frankie Edgar's reign atop the lightweight division.

With top challenger Ben Henderson on deck for Feb. 26 in Saitama, Japan, is Edgar in for his stiffest test to date against the former WEC king's boundless energy? Or, does the unrelenting offense and toughness of current Strikeforce lightweight champion Gilbert Melendez offer the Toms River, N.J., native his toughest task at 155?

Click here to read the latest ESPN MMA Hot Button.