From the latest issue of the Observer:
WWE EVENTS TOPPING ONE MILLION BUYS WORLDWIDE
1. 1.3m (estimate) - 4/1/12 - WrestleMania 28 (Rock vs. Cena)
2. 1.25m - 4/1/07 - WrestleMania 23 (Lashley w/Trump vs. Umaga w/Vince)
3. 1.12m - 4/3/11 - WrestleMania 27 (Cena vs. Miz/Rock as main draw)
4. 1.09m - 4/3/05 - WrestleMania 21 (HHH vs. Batista)
5. 1.04m - 4/1/01 - WrestleMania 17 (Rock vs. Austin)
5. 1.04m - 3/30/08 - WrestleMania 24 (Mayweather vs. Show)
7. 1.02m - 3/14/04 - WrestleMania 20 (HHH vs. Benoit vs. Michaels/Rock & Foley vs. Evolution)
In the segment-by-segment, the show started unusually low (2.90) for the Punk vs. Henry title match. The match and Chris Jericho post show interview gained 308,000 viewers. Santino Marella vs. David Otunga and the Brock Lesnar interview gained 117,000 viewers. Kane vs. Zack Ryder lost 306,000 viewers. The John Cena in/ring with John Laurinaitis gained 400,000 viewers to a 3.26 quarter. This is whats so crazy, with all the Daniel Bryan stuff and how over he was on TV, his match with Kofi Kingston lost 603,000 viewers to a 2.84 quarter. Brodus Clay vs. Dolph Ziggler gained 298,000 viewers. Great Khali & Big Show vs. Primo & Epico gained 205,000 viewers. And the John Cena vs. Lord Tensai main event gained 319,000 viewers, which is a poor overrun gain, but nobody cared about Tensai, to a 3.42.
Unlike the usual fairly steady ratings pattern, this show had major ups and downs, including an 0.83 first quarter with Eric and Garett Bischoff setting up their Lethal Lockdown teams. For whatever reason, a ton of people tuned in late. Mr. Anderson vs. Gunner and the Machine Guns interview/angle with Samoa Joe & Magnus and Mexican America gained 186,000 viewers. Austin Aries vs. Christopher Daniels lost 86,000 viewers. The Jeff Hardy interview lost 14,000 viewers. The Eric Young wedding gained 286,000 viewers, so they did spike for the wedding itself up to a 1.11. Bully Ray vs. A.J. Styles gained 43,000 viewers to a 1.14 rating which was the peak of the show. Then Madison Rayne & Gail Kim vs. Velvet Sky & Mickie James lost 243,000 viewers. The final segment of the show with Bobby Roode and James Storm going face-to-face gained 43,000 viewers to a 1.00.