The show put NBC at #3 for the night behind CBS, who had the Houston Texans vs. New Orleans Saints pre-season game, and ABC which had the NASCAR Cup. FOX had re-runs.
Here are the viewerships for the last for WrestleMania NBC specials:
8/29/09 – WM25 special averaged 3.97 million viewers
8/6/10 – WM26 special averaged 1.78 million viewers (hurt by pre-emptions)
8/13/11 – WM27 special averaged 3.64 million viewers
8/25/12 – WM28 special averaged 2.73 million viewers