Key Facts

• José Castillo is a baseball pitcher who played for four teams this season: the Arizona Diamondbacks, New York Mets, Seattle Mariners, and Baltimore Orioles.
• The Baltimore Orioles claimed Castillo from the Mariners but later put him on waivers due to the return of injured players.
• The New York Mets have claimed Castillo again, leading to his second stint with the team.
• Castillo has played in 69 major league games in his career, with a 4.11 ERA (a measure of a pitcher's effectiveness; lower numbers are better).
• This year, Castillo played in 29 games, striking out 30 batters, walking 14, and allowing 40 hits in 32 innings.
• Castillo does not have options to play in the minor leagues, meaning he must stay on the major league roster.
• The Mets can keep Castillo on their 40-man roster, giving him the opportunity to compete for a bullpen spot in spring training.