From BR Bullpen
Kelvin DeJesus Herrera Mercado
- Bats Right, Throws Right
- Height 5' 10", Weight 190 lb.
 Biographical Information
Pitcher Kelvin Herrera was signed by scouts Daurys Nin and Rafael Vasquez for the Kansas City Royals in 2006. He made his pro debut with the DSL Royals in 2007 and reached the majors with the club in 2011.
With his fastball regularly timed over 100 mph, he was part of a devastating Royals bullpen that was key to the team reaching the 2014 World Series. His particular specialty was as a 7th-inning set-up man, who would then hand the ball over to Wade Davis in the 8th and to closer Greg Holland in the 9th. The trio was so effective that in effect, the Royals' opponents had to be in the lead by the end of the 6th inning if they wanted to have any hope of ending up on the winning side. Herrera was 4-3 with a 1.41 ERA in 70 games that year, getting credit for 20 holds in 21 opportunities. In the postseason, he put up an ERA of 1.80 in 11 games and was credited with the win over the San Francisco Giants in Game 2.
On April 21, 2015, Herrera was suspended for five games for throwing a pitch behind the head of Brett Lawrie of the Oakland A's on April 19th; the Royals had been all over Lawrie since he had injured SS Alcides Escobar with a hard slide in the series' opener two days earlier. Home plate umpire Greg Gibson immediately ejected Herrera, and the Commissioner's office concurred that the pitch was both dangerous and intentional, in spite of Kelvin,s protests to the contrary.