2. John Cena
Brock Lesnar challenged the then WWE World Heavyweight Champion John Cena at SummerSlam 2014 which ended as a one sided battle. Lesnar absolutely destroyed Cena in what can be called as one of the worst title defenses by a champion.
Lesnar delivered an F-5 in the first 30 seconds of the match but Cena powered out of it, however Lesnar unleashed 16 German Suplexes giving the champion almost no time. He won the match after delivering a second F-5 and won the WWE World Heavyweight Championship with ease.
Cena also kicked out of the F-5 at Extreme Rules 2012. Lesnar had delivered an F-5 but knocked the referee out by mistake and by the time another referee came in, Cena kicked out at two. Cena won the match after delivering an AA on the metal steps.