In what has otherwise been a disastrous season for the Kansas City Royals, 23-year-old first baseman Billy Butler has had a breakout season, with an .842 OPS. But perhaps most impressively of all, Butler is on pace to hit 49 doubles.
The list of players who have hit at least 49 doubles in their age 23 season or younger is very short, and very exclusive. In fact, only seven players have ever done it. Have a look: