Castellanos decides not to opt out, keeps contract with Reds
Cincinnati Reds Reportedly Not Interested in Nick Castellanos, Sports & Recreation, Cincinnati
Nick Castellanos exercises opt-out clause in deal with Cincinnati Reds to become free agent - ESPN
What's next for Reds once Nick Castellanos makes opt out decision?
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Even With His Contract Opt-Outs and Universal DH, You Probably Shouldn't Get Any Nick Castellanos Hopes Up - Bleacher Nation
Nick Castellanos reflects on return to Cincinnati
Nick Castellanos decides to stick with Cincinnati Reds rather than hit free agency - ESPN
NL Central 2020 Offseason Moves and 2021 Outlook: Cincinnati Reds - Viva El Birdos
Phillies sluggers cold again in NLCS, Nola falters in Game 6 loss to Arizona
Nick Castellanos, the delayed 2020 season, and how opt-out clauses will impact Reds moves - Red Reporter
The Reds never even gave Nick Castellanos a phone call - Redleg Nation