I can't believe there isn't a sport photography sub-forum here, and if this should be moved, please do.
Citius, Altius, Fortius
Pick you most iconic/telling/moving/artistic of an athlete at play, candid or posed prior to 1988. Time must wash away fleeting fads before true greatness can be seen.
I will start off with the product of the greatest love affair even known between athlete and camera: any image involving Muhammed Ali.
I've chosen this lesser known but superb shot (though not actually my absolute favorite*)
*My favoite image is MA sitting relaxed at country restaurant. He cool, calm, and at ease. Too bad I can't find it. When I do, I'll post it.