Report: White Sox sign Kelvin Herrera as they wait for Bryce Harper and Manny Machado decisions
Royals trade Kelvin Herrera for three Nationals prospects - Royals Review
White Sox, All-Star pitcher Kelvin Herrera finalize 2-year, $18 million deal
Nationals trade three prospects to Royals for Kelvin Herrera - Minor League Ball
MLB trade deadline: Washington Nationals get Kelvin Herrera from Royals for 3 prospects
Former Royals reliever Kelvin Herrera retires - Royals Review
Royals trade Kelvin Herrera to the Nationals
Major-league teams needing relief should look at these five arms
Nationals acquire Kelvin Herrera. The Washington Nationals acquired…, by Nationals Communications
Nats get RHP Kelvin Herrera from Royals for 3 minor leaguers
Nationals acquire Kelvin Herrera. The Washington Nationals acquired…, by Nationals Communications