Cade Cavalli, 2020 first-round pick, to join Nationals' pool as third player opts out

Washington Nationals manager Dave Martinez revealed Friday that catcher Welington Castillo declined the invitation to join the team's 60-man player pool and opted out of the season. Castillo is the third Nationals player to opt out, following first baseman Ryan Zimmerman and starting pitcher Joe Ross. "I talked to [Castillo] ...