Jake Arrieta placed on injured list with right hamstring tightness
Jake Arrieta - Wikipedia
Phillies notebook: Jake Arrieta progressing well; more tests for Pat Neshek, Mark Leiter Jr. – Delco Times
Arrieta Not Coming Off IL, Wisdom's Year, Cubs Sign Nine, Walk-Off Bunt, and Other Cubs Bullets - Bleacher Nation
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Chicago Cubs put Jake Arrieta on the 10-day injured list with right hamstring tightness
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LEADING OFF: Clayton Kershaw, Jake Arrieta to injured list – Saratogian