Ned Yost won a World Series and two pennants in his almost 10 full seasons as manager of the KC Royals. He owns the highest postseason winning percentage among managers with at least 20 October/November contests and is the winningest field boss in club history.
The latter fact may, frankly, be more a function of Yost’s longevity than of his overall managerial acumen. He managed longer than any other Royals skipper–nine full seasons and part of another–yet had just three winning teams and skippered another to a .500 record. His clubs lost 90 or more games (over 100 twice) in four of his other five full campaigns.