Best 1 year wonder career seasons.

Not really a 1 year wonder, but it was wacky how 170 lb second baseman Davey Johnson hit 43 home runs in 1973 (MLB record for 2nd baseman?), 1 behind MLB HR champ Willie Stargell, despite having more than 10 in only a few seasons. No one in the AL hit more than Reggie Jackson's 32.

Being traded to Atlanta helped - 26 HR at home - and Aaron helping him become a zone hitter rather than looking for a type of pitch.

Then in 1974 when he hit 15, his errors shot up from 6 to 30, he got released 4 days into 1975, went to Japan for 2 years, and had little left when he returned.