In 1997, Shawn Michaels vacated the WWF Championship, leaving the new holder to be decided in a four-way elimination match between Undertaker, Bret Hart, Vader and "Stone Cold" Steve Austin. Bret won the match and the title but then lost it to Sid in a match the next night on Monday Night Raw. While Hart and Austin would continue their feud, Undertaker was left free to challenge Sid for the title at WrestleMania. In a match for the WWF World Heavyweight Championship, the finish came when Bret Hart interfered in the match and hit Sid with a steel chair to help The Undertaker take advantage and deliver a Tombstone Piledriver.