#1 The Undertaker and 'Stone Cold' Steve Austin

Stone Cold Steve Austin and The Undertaker were involved in a fairly complicated rivalry over the summer of 1998 that also featured Taker’s demonic half-brother, Kane, and everyone’s favourite lunatic, Mankind.
At King of the Ring, Austin lost his WWE Championship to Kane, following an accidental interference from The Undertaker, who was attempting to take out Kane. While Austin won the title back just one night later, there was still animosity between him and Taker, something Austin’s arch-rival, Vince McMahon, was quick to exploit.
McMahon put Taker and Austin together to battle Kane and Mankind for the latter’s World Tag Team Championships at Fully Loaded, in an attempt to drive a wedge even further between Austin and The Deadman.
However, Taker and Austin won the match and the titles, making Austin both the World Champion and Tag Team Champion while Undertaker clinched just the Tag Team Champion belt.
Over the course of their reign, it became clear that Austin and The Undertaker were not exactly best of friends, perhaps due to The Undertaker’s status as number one contender to Austin’s WWE Championship at the upcoming SummerSlam.
Austin and Taker’s reign came to an end after just 15 days, losing the titles back to Kane and Mankind on an episode of Raw, adding further interest to their SummerSlam title match.