Orioles outfielder Mark Trumbo will take part in the 2016 T-Mobile Home Run Derby on tonight at San Diego's Petco Park (8 p.m. ET on ESPN and simulcast on MLB.com), leading into Tuesday's 87th All-Star Game presented by MasterCard (7:30 p.m. ET on FOX).
Trumbo currently leads the Majors with 28 home runs, just six shy of his career-high of 34 set in 2013 while with the Angels.
The other participants in this year's competition are defending champion Todd Frazier of the White Sox, the Marlins' Giancarlo Stanton, the Rockies' Carlos Gonzalez, the Mariners' Robinson Cano, the Padres' Wil Myers, Dodgers rookie Corey Seager and the Reds' Adam Duvall.
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The players were seeded one through eight based on home run totals through Wednesday. As the top seed, Trumbo will take on No. 8 Seager in the first round, with the winner of that matchup facing the winner of No. 4 Cano and No. 5 Stanton in the semifinals.
On the other side of the bracket, No. 3 seed Duvall faces No. 6 Myers and No. 2 Frazier meets No. 7 Gonzalez in the first round.
The winners of those two matchups will meet in the other semifinal. Then the last two sluggers standing hack for the home run derby title.

The rules of the competition, which was modified beginning with last year's Derby, are as follows:
• Single-elimination tournament in which the winner of each matchup advances and the loser of each matchup is eliminated.
• If the second batter hits more home runs than the first batter in any matchup, he will be declared the winner and not attempt to hit additional home runs.
• Four minutes per batter for each round. Clock starts with the release of the first pitch. In the first round and semifinals, each batter is entitled to one 45-second "time out." In the finals, each batter is entitled to two 45-second "time-outs."
• Thirty seconds of bonus time will be awarded for two home runs that each equal or exceed 440 feet.
• Ties in any round will be broken by a 60-second swing-off with no stoppage of time or additional time added. If a tie remains after the swing-off, batters will engage in successive three-swing swing-offs until there is a winner.

Trumbo previously participated in the Home Run Derby in 2012 at Kansas City's Kauffman Stadium, hitting a total of 13 homers -- seven in Round 1 and six in Round 2. The Blue Jays' Jose Bautista beat Trumbo in Round 2 to advance and leave him with a third-place finish.
Only two Orioles have won the Derby since it started in 1985: Cal Ripken Jr. (1991) in Toronto and Miguel Tejada (2004) in Houston. Trumbo's teammate Manny Machado hit 12 last year in the opening round, but the Dodgers' Joc Pederson edged him out.

Trumbo has hit some mammoth homers so far this season, including his longest -- a Statcast-projected 458-foot shot on June 2 against Rick Porcello of the Red Sox. He was the first player in the Majors to reach the 20-homer mark and has already eclipsed his total from last season.
More numbers on Trumbo's homers this season, courtesy of Statcast™:
Longest HR of 2016: 458 feet, June 2 (sixth inning) vs. Red Sox, off Porcello
Hardest-hit HR of 2016: 114.8 mph, June 2 (fourth inning) vs. Red Sox, off Porcello
Average HR distance in 2016: 411 feet