I was born in 1980. Some of my earliest sports memories were of Mike Tyson beating the crap out of people. However the recent exploits of Ronda Rousey have given me pause as to who is the most dominant athlete I've ever seen.
My top 3
1) Ronda Rousey
2) Mike Tyson
3) Shaquille O'neal
Honorable Mention( Serena Williams, Michael Phelps, LeBron James)