What is each sport's signature player?

As a non-sports fan -

Baseball - Babe Ruth
Basketball - Michael Jordan
Football - Bart Starr
Hockey - Wayne Gretzky
Golf - Tiger Woods
Tennis - Bill Tilden
Soccer - Pele
Speed skating - Eric Heiden

Speaking as a fan -
Judo - Yasuhiro Yamashita
Greco-Roman wrestling - Alexsandr Karelin
Freestyle wrestling - John Smith
Boxing - Muhammed Ali
Powerlifting - Ed Coan
Olympic lifting - Vasiley Alexeyev
Swimming - Michael Phelps
Track and field - Jesse Owens
Regards,
Shodan

That depends. Was Fidel Castro a starting pitcher in MLB?

Right, but my point is that more people would have to ask “Who is Nolan Ryan?” than would have to ask "Didn’t Babe Ruth pitch?

Gosh, I wouldn’t think so, no. Ruth’s pitching prowess isn’t commonly known outside the fandom of the sport. My Mom knows who Nolan Ryan is.

He pitched professionally. Don’t know what MLB has to do with it.

Schwarzenegger for bodybuilding?