"Of course… there is really no question in my mind that the best ballplayer over the last decade has been Willie Mays. Willie is a little older now… but he is still a tremendous ballplayer and again, next year, he could be the greatest again. When you talk about the decade, you’ve got to consider Willie. Today… today we have a lot of fine players. I’d have to say that Roberto Clemente, who over a period of years has led the league in several departments, would be a great asset to any team. Henry Aaron, of course… and a lot of people underrate Pete Rose. On the basis of the little we saw of him in the World Series, you’d have to put Carl Yastrzemski right up there with the superstars. You cannot pin me down on this. You can split them up. Mays in his prime, you could make a choice. My choice would be easy. But now… now, if you must pin me down to just one… at this moment… I would say Clemente."
January 1, 1970
https://en.wikiquote.org/wiki/Roberto_Clemente