Top 5 Sports Peaks of All Time

This one is gonna cause some arguments but thought it’d make for an interesting discussion! A lot gets made of who the top all time players are in their sports. This is generally a discussion on who had the best careers overall (championships etc). But I’m curious to know who had the best peaks all time. Who really were the best players when they were at their best. Let’s keep it between the major 4 US sports (NFL, NBA, MLB, NHL).