The endurance category has to go to Eddy Merckx in 1972. Even with all the dope in the world, this list will never be touched. Untold thousands of miles on a 30 lb. steel bike, no less.
As a pure physical specimen, Bron will most likely go down as most complete player of the modern era. I'm not taking anything away from Jordan or Kobe, but LBJ was literally born for no other purpose than basketball. He is the most well rounded player minute-for-minute taking into accounts both sides of the ball imho. I know he doesn't have Jordan or Kobe's trophies, but there's something very different about watching his play. To me, it's more natural.
That being said though, no one in sport will ever match Tiger's 4 majors. Doing the odds on that would be astronomical.
Also, gotta mention Federer, shattered the record with 300 consecutive weeks at #1 on the planet. Unreal domination.