#1 Yet to lose a WWE match in 2020: Jinder Mahal
There was a time in WWE when Jinder Mahal was an enhancement talent, teaming up with Heath Slater and the current WWE Champion Drew McIntyre as 3MB. After being released by WWE in 2014, he worked extremely hard and got back with a great physique and a new attitude in 2016.
The initial days after his return wasn't any good. But things changed for Mahal when he faced and defeated Randy Orton to win the WWE Championship at Backlash 2017. He went on to hold the title for 170 days before losing it to AJ Styles. He then won the United States Championship at WrestleMania 34.
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After a long hiatus due to a knee injury, Jinder Mahal returned to RAW in April 2020. Unfortunately, he underwent another knee surgery and is out-of-action again. During his short return, he competed in three matches, winning all of them. Thus, he is technically undefeated in WWE in 2020. It is to be seen whether he'll return to action this year or not. He was rumored to face and challenge Drew McIntyre for the WWE Championship before his surgery.