#2 Rusev

Rusev arrived on the main roster in 2014 as a monster heel with his manager Lana. Rusev had a massive debut year and remained undefeated throughout.
Rusev even won the US Championship from Sheamus and went on to defeat John Cena at Fastlane 2015. The feud with Cena however, proved to be a disaster for Rusev as he went on to lose 3 matches against John Cena at Wrestlemania 31, Extreme Rules and Payback. Rusev dissolved his partnership with Lana too. These losses killed Rusev’s push.
Rusev re-aligned with Lana in 2016 and Rusev once again became a monster heel. He decimated Kalisto to win his 2nd US title.
During the brand split, Rusev and Lana were drafted to Raw. Rusev’s push ended once again when he was defeated by Roman Reigns for the US title at Clash of Champions 2016 and was pushed down the card. In 2017, Rusev got drafted to Smackdown Live and after struggling for a few months, Rusev introduced the Rusev Day gimmick which got really over with the fans.
Rusev received a shot at the WWE title at Extreme Rules 2018 but he lost to AJ Styles. Rusev is currently one of the most over superstars on Smackdown Live. Rusev may not win a World Title in WWE but he has truly established himself as one of the most entertaining and hardworking superstars on the roster.
Becky Lynch has been challenged HERE.