Erasmo José Ramírez Olivera (born May 2, 1990) is a Nicaraguan professional baseball pitcher in the Minnesota Twins organization.

He has previously played in Major League Baseball (MLB) for the Seattle Mariners, Tampa Bay Rays, Boston Red Sox, New York Mets, Detroit Tigers, and Washington Nationals.

[1] The school which he attended, Fundación Educando a un Salvadoreño, was aimed at helping baseball and soccer athletes training in their respective sports, while also offering academic support.

[1] From there, Ramírez was discovered by Jorge Bahaia, who introduced him to Seattle Mariners scouts Ubaldo Heredia and Bob Engle.

[3] Ramírez began his professional baseball career in 2008 with the rookie-level VSL Mariners of the Venezuelan Summer League.

[5] After the season, the Seattle Mariners named Ramírez as the pitcher of the year in their minor league organization.

He eventually spent time in Triple–A before making his debut of the season with the Mariners on July 11 against the Boston Red Sox, but allowed seven runs in 4 2/3 innings.

The following day, Ramírez was sent down to the Everett AquaSox in order to allow him to stay on a regular rotation during the Major League All-Star break,[10] and started July 17's game against the Vancouver Canadians, giving up two runs on six hits while striking out ten in 5 1/3 innings as the AquaSox won 7-6.

But, when he came back in mid-May from the Durham Bulls he was better for the rotation and team, putting up great numbers for the rest of the season.

[19] In November 2018, Ramírez elected to become a free agent after clearing waivers and being outrighted off the Mariner's 40-man roster.

On April 16, his contract was selected by Boston,[21] and he made his Red Sox debut the same day, allowing four runs in three innings of relief during an 8–0 loss to the Yankees in New York.

On January 19, 2021, Ramírez signed a minor league contract with the Detroit Tigers, with an invitation to spring training.

[34] On June 12, 2023, Ramírez signed a minor league contract with the Tampa Bay Rays organization and was assigned to the Triple–A Durham Bulls.

[40] Ramírez re-signed with the Rays on a minor league contract on December 6,[41] and began the 2024 season with Triple–A Durham.

[52] Ramírez participated with the Nicaraguan team in the 2023 World Baseball Classic, the country's first ever appearance at a WBC tournament.

[54] Ramírez gave up several RBI singles in relief against Puerto Rico, yielding three runs in a 9–1 loss (though all but one of the runners were inherited).

[55] He then started Nicaragua's final game against Venezuela, pitching three scoreless innings, outlasting Eduardo Rodriguez and striking out Ronald Acuña Jr.