1901 Nap Lajoie (9.4 bWAR)
He paced both leagues with 145 runs, 232 hits, 48 doubles, 350 total bases, and a sterling .426/.463/.643 line, good for the major league sabermetric Triple Crown and a 1.106 OPS/200 OPS+. All of those totals represent career highs except for doubles, RBI and OPS+. He also rounded out his stat line with 14 triples and 27 steals, and whiffed just nine times. In the heart of the deadball era, those are some darn good numbers that mimic a prime season from Rogers Hornsby. Unfortunately for that A's, they lost their best player to free agency the following spring (during his age 27 season) and were forced to watch him put together a Hall of Fame career in Cleveland, where he won four more batting titles and reached 3,000 hits. They did manage to purchase him for his final two seasons, but by then he was in his 40s.