Defending champion Todd Frazier and Mark Trumbo lead the field for Monday’s All-Star Home Run Derby in San Diego.

Frazier, second in the American League with 23 homers, will take on Colorado’s Carlos Gonzalez in the first round, while Trumbo — the No. 1 seed and current major league leader with 26 — faces the Los Angeles Dodgers’ Corey Seager.

Cincinnati’s Adam Duvall is paired with the host Padres’ Wil Myers and Seattle’s Robinson Cano will go against Miami’s Giancarlo Stanton in the other matchups. The Trumbo-Seager winner will face Cano or Stanton in the semifinals, while the Frazier-Gonzalez winner will go against Duvall or Myers.

Brackets were based on season home run totals through Wednesday.

Each batter gets four minutes per round. A batter may call a 45-second timeout in each of the first two rounds, and two in the final. Players can earn 30 seconds of bonus time with two homers of 440 feet or more.