Santo won 5 Gold Gloves, Nettles won two. Nettles was never the best third baseman in his leage, Brooks passed that torch to Brett. Santo was a 9 time All Star, Nettles was picked six times.
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I really don't know - is the push for Santo primarily for his tremendous fielding? His fielding ptc. is lower than that of the 5 primary HOF 3rd baseman except Traynor, who by all accounts made spectacular plays using lesser equipment on poorer fields (and was a superior hitter).