The Undertaker vs Shane McMahon
I'm thinking outside interference will be the cause of Shane McMahon successfully defeating The Undertaker on the grandest stage of 'em all, WrestleMania. But who interferes? Honestly, it could be several potential stars. I'm going with the idea that John Cena returns from injury and costs Taker the match, setting up for the much anticipated Cena vs Taker and WrestleMania 33.
Winner at Mania: Shane McMahon
Roman Reigns vs Triple H vs Dean Ambrose vs Brock Lesnar
March 12 on the WWE Network, Dean Ambrose and Triple H are set to face each other for the WWE World Heavyweight Championship. I'm predicting for Dean to defeat Triple H in their match, making WrestleMania's main event be a fatal four way for the title featuring of course Reigns, Triple H, Ambrose, & Lesnar. That'd help avoid the likely scenario of Reigns being booed out of the stadium, like he almost was the previous year.
Winner at Mania: Triple H