Overview

• Walker has struggled with injuries and performance, posting a 5.60 ERA in 10 starts this season.
• The inflamed finger has particularly affected Walker's ability to throw his effective splitter.
• Turnbull, who has a 2.63 ERA this season, will start Wednesday against his former team, the Tigers.
• Mercado, a top prospect, is set to make his MLB debut after excelling in Triple-A with a 1.71 ERA.
• Walker will continue to throw fastballs while on the IL to maintain arm strength.