"Clemente had the ability, no doubt about it, but he was, for instance, always trying to show off his arm. He was always trying to throw out runners at the plate, instead of throwing the ball to the cut-off man and preventing the hitter from taking the extra base. Instead of having runners at first and third, and still having the chance to get a double play, you’d have runners at second and third and no chance to get the double play. It makes it a lot tougher on the pitcher. He wouldn’t throw the ball down where Groat could grab it as the cut-off man or let it go if he thought Clemente’s throw could get the lead runner out. Clemente had a strong arm, but he was always trying to show it off. Early on, he used to throw the ball into the stands, but he got more accurate as he went on. He made some great throws and got some guys out, but there were more times he didn’t get the guy. Little things like that. As a player, you realize the significance of such things. The fan just sees him getting a guy out at home plate. But he did that two out of ten times. It looked great to the fans, and it was great for the Pirates if he got someone out like that. But more often than not, he was putting more pressure on the pitcher."
January 1, 1970
https://en.wikiquote.org/wiki/Roberto_Clemente