The Undertaker began a feud with then WWE Champion John "Bradshaw" Layfield (JBL) by challenging him to a title match at SummerSlam, which The Undertaker lost by disqualification. At No Mercy, The Undertaker and JBL competed in the first-ever Last Ride match, although The Undertaker lost after Heidenreich interfered. After defeating Heidenreich in a match at Survivor Series, The Undertaker turned his focus to the WWE Championship once again. Along with Eddie Guerrero and Booker T, he challenged JBL to a championship rematch at Armageddon in a fatal four-way match, in which The Undertaker was unsuccessful, again due to Heidenreich's interference. The feud culminated in a casket match between The Undertaker and Heidenreich at the Royal Rumble, where Undertaker sealed Heidenreich in a casket for the victory.