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Jeff Lichtman...led the league in hitting 11 times, slugging percentage 8 times, on base percentage 7 times, on base + slugging percentage 10 times, hits 8 times, doubles 3 times, triples 4 times, Home Runs once, RBI 4 times, and stolen bases 6 times. .366 lifetime BA and 4000 hits.
In 1909, Cobb led the league in batting average, on base percentage, slugging percentage, runs, hits, total bases, home runs, RBI, and stolen bases. And he obviously won the Triple Crown.
I'm not sure anyone has ever had a year as relatively good as Cobb's 1909.