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Zack Greinke Officially Opts Out Of Contract : r/baseball
MLB: Astros get Greinke in trade with Diamondbacks
Pat Neshek airs his beef with Zack Greinke over autograph snub
D-backs finalize Madison Bumgarner's $85 million, 5-year deal – The Denver Post
D-backs return home after gaining clarity, losing ace Zack Greinke
Three reasons the D-Backs would consider trading Zack Greinke
Zack Greinke trade: Astros acquire Diamondbacks' ace - Sports Illustrated
Potential Trade Packages and Landing Spots for MLB Ace Zack Greinke, News, Scores, Highlights, Stats, and Rumors
Zack Greinke continues to impact D-backs, Royals
Report: D-backs talking possible Greinke trade