#2 - Big Show - 12 losses

The World's Largest Athlete has lost 12 matches at WrestleMania, quite a poor record considering the huge size of the Big Show. He lost his WrestleMania debut match via disqualification against the Mankind before losing a fatal 4-way WWF Championship match the next year. Big Show's record then became 0-3 after he suffered a defeat in a triple threat match for the Hardcore Championship also involving Kane and Raven.
His record went on getting worse as he lost 3 more matches before winning his 1st ever WrestleMania match at WrestleMania 22. The Big Show then lost to Floyd Mayweather in a No Disqualification match. His last 3 WrestleMania appearances have been in the Andre the Giant Memorial Battle Royale match, a match which he won once at WrestleMania 31. However, he has failed to win the other battle royales which have increased his number of losses to 12.
Becky Lynch has been challenged HERE.