#4 Brock Lesnar vs. Kurt Angle
If Batista isn't available to be the Beast's next challenge, then Kurt Angle could make a great replacement.
Part of SmackDown during the brand's arguable high-point in the early 2000s, Angle and Lesnar are known rivals, competing for the title in the main event of WrestleMania 19.
Whilst both men may be considerably older now, it's safe to say a battle between the Olympic gold medalist and the Beast Incarnate would still be highly entertaining.
Angle has impressed in his few matches in WWE since returning in 2017, and Lesnar, though he receives criticism for his sporadic appearances as Universal Champion, always brings a must-see feel to all his matches.
If the WWE play their cards right, a Lesnar-Angle feud could be the biggest thing to see in 2019.