Reds' Castellanos opts out of contract, becomes free agent - WTOP News
Nick Castellanos opts out of Reds contract, becomes free agent - Redleg Nation
Nick Castellanos To Exercise Opt-Out Clause - MLB Trade Rumors
Report: Mets Looking For Significant Upgrades At Two Positions This Offseason - Sports Illustrated New York Mets News, Analysis and More
Nick Castellanos Is Mashing Again
Nick Castellanos exercises opt-out clause in deal with Cincinnati Reds to become free agent - ESPN
Nick Castellanos signs with Reds, so where do the Giants go from here? – Daily Democrat
Nick Castellanos, the delayed 2020 season, and how opt-out clauses will impact Reds moves - Red Reporter
Nick Castellanos set to reject Reds qualifying offer (report)
Buyers and Sellers: Cincinnati Reds Edition