UPDATE: WWE announced at Sunday night's Fastlane event that the one-on-one match between Sting and Triple H has officially been confirmed for WrestleMania 31.
ORIGINAL REPORT: At Sunday night's WWE Fastlane event, Sting officially challenged Triple H to a one-on-one match at WrestleMania 31 following their in-ring face-to-face confrontation.
The challenge was made after a physical altercation between the two. Sting pointed his trademark black bat to Triple H's throat before pointing it to the WrestleMania 31 sign hanging in the arena.
As previously reported, this match has been rumored to be taking place for some time now, and it's expected that WWE will make the match official in the coming days.