#4 Brock Lesnar
Start - WrestleMania 33, 2nd April 2017
End - SummerSlam 2018, 19th August 2018
Title Defenses on PPVs - 7
No. of Days as Champion - 504
Brock Lesnar did not defend his title for 3 months after winning it as his first title defence came on 9th July 2017 at the Great Balls of Fire PPV. Lesnar had memorable feuds with Samoa Joe, Braun Strowman, Kane and Roman Reigns during his 504-day reign.
The Beast Incarnate also had an epic match with the Phenomenal AJ Styles at Survivor Series 2017 where the WWE Champion pushed the Universal Champion to his limits. Brock featured in numerous first time ever feuds during his reign but the way he easily defeated the young superstars left a sour taste in the WWE Universe's mouth.
Overall, Lesnar made the title more prestigious and relevant than ever as his appearances made RAW an exciting show. I give a "B+" grade to the Conqueror's 504 day Universal Championship reign.