Matt Hardy
The secondary feud for SmackDown heading into Backlash was between Matt Hardy and MVP. On the November 16th, 2007 edition of SmackDown after failing to regain the Tag Team Championship from John Morrison and The Miz, MVP attacked Matt Hardy targeting and injuring his knee. The feud would start again at WrestleMania XXIV where Matt Hardy cost MVP the Money in the Bank Ladder Match by performing a Twist of Fate at the top of the ladder. Hardy would then face MVP on the April 4th, 2008 edition of SmackDown in a non-title match, which he won. It was confirmed on the next SmackDown that Matt Hardy would face MVP for the United States Championship at Backlash.