Castillo has moved rapidly through the Rays organization since signing for $64,000 out of the Dominican Republic as a 20-year-old in 2014. He has received in-season promotions in each of the past three campaigns, and parlayed a strong performance in the Arizona Fall League in 2016 into stints at Double-A Montgomery and Triple-A Durham in 2017. In 71.2 combined innings, the chunky, hard-throwing righthander went 15-for-18 in save opportunities, including saves in both the Governors' Cup-clinching victory and the Triple-A national championship game. Castillo is a classic fastball/slider, high-effort reliever who has touched 101 mph with his four-seamer. He generates a lot of ground balls but tends to give up a fair number of hits when hitters start making contact. Castillo has good overall control and command, but gets in trouble when he overthrows, reducing the movement on his pitches. Despite his late-season success as a closer, Castillo profiles better as a high-leverage reliever. He will compete for a job in the Rays bullpen in 2018.
Career Transactions
RHP Diego Castillo assigned to Estrellas Orientales.
RHP Diego Castillo assigned to Toros de Tijuana.
Albuquerque Isotopes released RHP Diego Castillo.
Albuquerque Isotopes activated RHP Diego Castillo from the temporarily inactive list.
Albuquerque Isotopes placed RHP Diego Castillo on the temporarily inactive list.
Albuquerque Isotopes placed RHP Diego Castillo on the 7-day injured list.
Albuquerque Isotopes placed RHP Diego Castillo on the 7-day injured list.
RHP Diego Castillo elected free agency.
Minnesota Twins sent RHP Diego Castillo outright to St. Paul Saints.
Minnesota Twins designated RHP Diego Castillo for assignment.
Minnesota Twins recalled RHP Diego Castillo from St. Paul Saints.
St. Paul Saints activated RHP Diego Castillo.
Minnesota Twins optioned RHP Diego Castillo to St. Paul Saints.
Minnesota Twins selected the contract of RHP Diego Castillo from St. Paul Saints.
RHP Diego Castillo assigned to St. Paul Saints.
Minnesota Twins signed free agent RHP Diego Castillo to a minor league contract.
RHP Diego Castillo elected free agency.
St. Paul Saints activated RHP Diego Castillo.
Minnesota Twins designated RHP Diego Castillo for assignment.
Minnesota Twins optioned RHP Diego Castillo to St. Paul Saints.
Minnesota Twins selected the contract of RHP Diego Castillo from St. Paul Saints.
RHP Diego Castillo assigned to St. Paul Saints.
Minnesota Twins signed free agent RHP Diego Castillo to a minor league contract.
Round Rock Express released RHP Diego Castillo.
Texas Rangers signed free agent RHP Diego Castillo to a minor league contract and invited him to spring training.
Texas Rangers signed free agent RHP Diego Castillo to a minor league contract.
RHP Diego Castillo assigned to Round Rock Express.
RHP Diego Castillo assigned to Tigres del Licey.
RHP Diego Castillo elected free agency.
Tacoma Rainiers activated RHP Diego Castillo from the temporarily inactive list.
Tacoma Rainiers placed RHP Diego Castillo on the temporarily inactive list.
Seattle Mariners sent RHP Diego Castillo outright to Tacoma Rainiers.
Seattle Mariners sent RHP Diego Castillo outright to Tacoma Rainiers.
Seattle Mariners optioned RHP Diego Castillo to Tacoma Rainiers.
Tacoma Rainiers activated RHP Diego Castillo.
Seattle Mariners optioned RHP Diego Castillo to Tacoma Rainiers.
Dominican Republic activated RHP Diego Castillo.
RHP Diego Castillo and assigned to Tigres del Licey.
Seattle Mariners activated RHP Diego Castillo from the 15-day injured list.
Seattle Mariners sent RHP Diego Castillo on a rehab assignment to Everett AquaSox.
Seattle Mariners placed RHP Diego Castillo on the 15-day injured list retroactive to July 26, 2022. Right shoulder inflammation.
Seattle Mariners activated RHP Diego Castillo.
Seattle Mariners sent RHP Diego Castillo on a rehab assignment to ACL Mariners.
Seattle Mariners placed RHP Diego Castillo on the 10-day injured list. Right shoulder inflammation.
Seattle Mariners activated RHP Diego Castillo.
Seattle Mariners traded RHP JT Chargois and 3B Austin Shenton to Tampa Bay Rays for RHP Diego Castillo.
Tampa Bay Rays activated RHP Diego Castillo from the 10-day injured list.
Tampa Bay Rays placed RHP Diego Castillo on the 10-day injured list. Right groin tightness.
Tampa Bay Rays activated RHP Diego Castillo from the 10-day injured list.
Tampa Bay Rays placed RHP Diego Castillo on the 10-day injured list.
Tampa Bay Rays activated RHP Diego Castillo from the paternity list.
Tampa Bay Rays activated P Diego Castillo from the paternity list.
Tampa Bay Rays activated RHP Diego Castillo from the paternity list.
Tampa Bay Rays placed RHP Diego Castillo on the paternity list.
Tampa Bay Rays activated RHP Diego Castillo from the 10-day injured list.
Tampa Bay Rays sent RHP Diego Castillo on a rehab assignment to GCL Rays.
Tampa Bay Rays placed RHP Diego Castillo on the 10-day injured list. Right shoulder inflammation.
Tampa Bay Rays recalled RHP Diego Castillo from Durham Bulls.
Tampa Bay Rays optioned RHP Diego Castillo to Durham Bulls.
Tampa Bay Rays selected the contract of Diego Castillo from Durham Bulls.
RHP Diego Castillo assigned to Tigres del Licey.
RHP Diego Castillo assigned to SOU North Division All-Stars.
RHP Diego Castillo assigned to Durham Bulls from Montgomery Biscuits.
RHP Diego Castillo assigned to Montgomery Biscuits from Charlotte Stone Crabs.
RHP Diego Castillo assigned to Tampa Bay Rays.
RHP Diego Castillo assigned to Peoria Javelinas.
RHP Diego Castillo assigned to Charlotte Stone Crabs from Bowling Green Hot Rods.
RHP Diego Castillo assigned to MID East Division All-Stars.
RHP Diego Castillo assigned to Tampa Bay Rays.
RHP Diego Castillo assigned to Bowling Green Hot Rods from Hudson Valley Renegades.
RHP Diego Castillo assigned to Hudson Valley Renegades from Princeton Rays.
RHP Diego Castillo assigned to Princeton Rays from DSL Rays.
RHP Diego Castillo assigned to DSL Rays.
Tampa Bay Rays signed free agent RHP Diego Castillo to a minor league contract.
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