#1 Nicholas - WWE RAW Tag Team Champion aged 10
In the build-up to WrestleMania 34, Braun Strowman decided to become involved in a tag team Battle Royale on RAW, despite not having a partner. At the time, WWE RAW Tag Team Champions The Bar had claimed that they had defeated every single tag team on their brand. They added they were ready for a new team to challenge them.
Even though Strowman didn't have a tag team partner, he emerged as the winner of the match. Kurt Angle, who was the RAW General Manager at the time, told Strowman that he would receive a shot at the titles at WrestleMania 34, if he had a partner in time for the event.
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At WrestleMania 34, Strowman did indeed get his title match and waited until he, Cesaro and Sheamus were in the ring to reveal his partner... a fan from the crowd. The fan in question was 10 year-old Nicholas, who ended up becoming the youngest-ever champion in WWE history after Strowman performed a running power slam on Cesaro.
The unlikely champions relinquished the WWE RAW Tag Team Championships a day later, due to Nicholas not being to defend the titles while still being a schoolboy.