Brock Lesnar is a true once-in-a-generation athlete. The 'Beast Incarnate' has done it all in WWE, winning world championships, Royal Rumbles and more, along with arguably the biggest accomplishment in professional wrestling - ending The Undertaker’s WrestleMania streak. If it is worth doing, Lesnar has done it.
The 'Conquerer' has faced and defeated some of the greatest pro wrestlers on the planet during his two stints in the company. Lesnar’s recent battles with the likes of ‘Taker, John Cena, Triple H, and Goldberg will live long in the memory, as will matches against Kurt Angle, Eddie Guerrero, and The Rock in the early 2000s.
There aren’t many major superstars that Lesnar hasn’t faced in one-on-one competition over his illustrious career. Only a small band of former world champions that were (or are) active during Lesnar’s two runs with WWE have managed to avoid the 'Beast Incarnate', for which their doctors must surely be thankful.
For clarification, only televised one-on-one matches matter here. House shows and multi-man matches obviously do not count.