At the beginning of Monday Night Raw The Authority revealed that they would be announcing the main event for the Fastlane pay-per-view before the show was over. During the closing segment of the Raw Dean Ambrose and Roman Reigns were beating down the League of Nations when Stephanie McMahon’s music hit.
Stephanie announced that the main event of Fastlane will be a triple threat match featuring Roman Reigns vs Dean Ambrose vs Brock Lesnar. The winner of the match will go on to challenge Triple H for the WWE Championship in the main event of WrestleMania 32.
https://twitter.com/WWE/status/691835711918641153