The Home Run Derby is an event played prior to the Major League Baseball All-Star Game. It is a contest among the top home run hitters in Major League Baseball to determine who can hit the most home runs. The event is currently sponsored by State Farm Insurance. Former sponsors included Century 21 Real Estate and Service Merchandise.
Eight players, who are generally on the All-Star Game rosters (though this is not necessitated by rule), are selected for the Home Run Derby and compete in a traditional playoff system where the players with the most home runs advance to the next round. Each player gets ten "outs" per round, where an out is defined as any swing that is not a home run in this case. Should a tie exist between players at the end of any round, there will be a five swing swing-off to determine who will advance. Until 2006, the home run count was reset after each round. However, a rule change was made for the 2006 Home Run Derby which causes the home run count for the four players advancing to the second round to carry over. The home run count for the final round is still reset to zero.
Prior to 1991, the Home Run Derby was structured as a two-inning event with each player receiving five outs per inning which allowed for the possibility of ties.