Castillo spent the past couple of seasons with the Nationals. He opted out of playing during the truncated 2020 season, and was part of the team's taxi squad earlier this year. The 34-year-old wraps up a 10 year big league career as a .254/.313/.426 hitter with 98 homers and 339 RBI in 726 games.

That's why Castillo has yet to appear in a Grapefruit League game up to this point, but the veteran catcher is throwing now and should see some live action relatively soon. Castillo, 33, signed a minor league deal with Washington in December after opting out of the 2020 season due to concerns about COVID-19. He's probably fourth on the club's depth chart behind Yan Gomes, Alex Avila, and Tres Barrera.

Castillo inked a minor league deal with the Nats last winter before officially opting out of the delayed 2020 season in early July because of concerns about COVID-19. The veteran catcher slashed .209/.267/.417 with 12 home runs and 41 RBI over 72 games (251 plate appearances) with the White Sox in 2019.

Castillo signed a minor league contract with the Nationals back in January and probably would have been carried as their third catcher, but he'll join teammates Ryan Zimmerman and Joe Ross in sitting out of MLB's planned 60-game 2020 campaign. Mike Leake of the Diamondbacks, Ian Desmond of the Rockies, and free agent Tyson Ross are also declining to participate this year amid the COVID-19 pandemic.