Champions of the All-Star Home Run Derby through baseball history are listed below. But first, here's a little background about the rules of the event:

Unlike the basic rules of baseball,  home run derby guidelines have changed frequently since the event started in the mid 1980s. The basic idea has revolved around a group of players —usually 4 from each league (but some years had 5) —competing to blast balls out of the yard.


Players had to stop swinging after making a predetermined number of  "outs" —i.e., hits that don't clear the fence. The number of outs has fluctuated over the years, between 7 and 10, with some rounds allowing just 5. And the guys with the most home runs would proceed to the next round. 

In 2015,  the rules changed, doing away with the concept of "outs" and making the event about who can hit the most homers in a 5-minute span. It became a single elimination tournament with eight seeded players who are paired off so seeds 1 and 8 compete to get to the next round, At the end of the third round, the winner is crowned.

 

• 2015 Todd Frazier, Cincinnati Reds (Great American Ball Park)
• 2014 Yoenis Cespedes, Oakland Athletics (Minneapolis, Target Field)
• 2013: Yoenis Cespedes, Oakland Athletics (New York, Citi Field)
• 2012: Prince Fielder, Detroit Tigers (Kansas City, Kauffman Stadium)
• 2011: Robinson Cano, New York Yankees (Phoenix, Chase Field)
• 2010: David Ortiz, Boston Red Sox (Anaheim, Calif., Angel Stadium)

• 2009: Prince Fielder, Milwaukee Brewers (St. Louis, Busch Stadium)
• 2008: Justin Morneau, Minnesota Twins (New York, Yankee Stadium)
• 2007: Vladimir Guerrero, Los Angeles Angels (San Francisco, AT&T Park)
• 2006: Ryan Howard, Philadelphia Phillies (Pittsburgh, PNC Park)
• 2005: Bobby Abreu, Philadelphia Phillies (Detroit, Comerica Park)
• 2004: Miguel Tejada, Baltimore Orioles (Houston, Minute Maid Park)
• 2003: Garret Anderson, Anaheim Angels (Chicago, U.S. Cellular Field)
• 2002: Jason Giambi, New York Yankees (Milwaukee, Miller Park)
• 2001: Luis Gonzalez, Arizona Diamondbacks (Seattle, Safeco Field)
• 2000: Sammy Sosa, Chicago Cubs (Atlanta, Turner Field)
• 1999: Ken Griffey Jr., Seattle Mariners (Boston, Fenway Park)
• 1998: Ken Griffey Jr., Seattle Mariners (Denver, Coors Field)
• 1997: Tino Martinez, New York Yankees (Cleveland, Jacobs Field)
• 1996: Barry Bonds, San Francisco Giants (Philadelphia, Veterans Stadium)
• 1995: Frank Thomas, Chicago White Sox (Texas, The Ballpark in Arlington)
• 1994: Ken Griffey Jr., Seattle Mariners (Pittsburgh, Three Rivers Stadium)
• 1993: Juan Gonzalez, Texas Rangers (Baltimore, Camden Yards)
• 1992: Mark McGwire, Oakland Athletics (San Diego, Jack Murphy Stadium)
• 1991: Cal Ripken, Baltimore Orioles (Toronto, SkyDome)
• 1990: Ryne Sandberg, Chicago Cubs (Chicago, Wrigley Field)
• 1989: Ruben Sierra, Texas Rangers (Anaheim, Anaheim Stadium)
• 1988: Rained out (Cincinnati, Riverfront Stadium)
• 1987: Andre Dawson, Chicago Cubs (Oakland, Oakland Coliseum)
• 1986: Wally Joyner, California Angels and Darryl Strawberry, New York Mets (Houston, Astrodome)
• 1985: Dave Parker, Cincinnati Reds (Minneapolis, Metrodome)

Note: Before 1991, the game was played as a two-inning event, which allowed for the possibility of ties.