Josh Hamilton hits 28 home runs in the first round of the Home Run Derby, a record for a single round. Hamilton fades after that and Justin Morneau goes on to win the event.
On July 14, 2008 Josh Hamilton hits 28 home runs in the first round of the Home Run Derby, a record for a single round. Hamilton fades after that and Justin Morneau goes on to win the event.
Source
Baseball Reference July 14