#4. Ken Shamrock - former UFC fighter
Ken Shamrock may not have competed in either the UFC or the WWE for some time, but he was one of the first fighters to have success in both fields. Shamrock last fought in the octagon in 2006 and his most recent WrestleMania appearance was all the way back in 1999.
Shamrock's first octagon bout came at UFC 1 and in total he had 15 fights with the promotion. He would have mixed results with the promotion, going 7-6-2, with three of those losses coming at the hands of Tito Ortiz. His overall MMA record was much more impressive and concluded at 28-17-2.
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Shamrock got to compete in some big-time spots at WrestleMania, most notably taking on Dwayne 'The Rock' Johnson in singles competition. Ultimately, however, he would be unsuccessful in both of his WrestleMania outings, failing in his efforts to win the Intercontinental Championship on each occasion.
#3. Shayna Baszler - former UFC bantamweight
Former UFC fighter Shayna Baszler was unsuccessful in her efforts at WrestleMania 37. Baszler and her teammate Natalya lost a fatal 4 way bout for the Women's Tag Team Championships. This was the third time she had competed at a WrestleMania event.
Before her run with WWE, Baszler was a pioneer in women's MMA. She competed in various organizations around the world before making her octagon debut in 2014. While she didn't pick up a win in the organization, her career record of 15-11 is more indicative of how talented a fighter she was.
Since joining WWE, Baszler has competed at WrestleMania three times. Her debut saw her lose to Becky Lynch for the Raw Women's Championship. She was then successful at WrestleMania 36, winning the tag team title alongside Nia Jax before losing in a bout for the same title this time around.