In which sport did Mark Calaway make his very successful professional career?

The Undertaker is a true legend

i knew this because he was married in the hotel i was a chef at, very nice man.

The man!!! Longest most successful career in all of wrestling. Saw him live in the 90's. Myself and about 100 others cheered for him. The rest of the crowd were just plain scared

The greatest character in wrestling, period.

Any true wrestling fan already knew the answer to this question.