September 22, 2015: Cubs' Jake Arrieta tosses 3-hit shutout for 20th victory – Society for American Baseball Research
Jake Arrieta - Wikipedia
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Jake Arrieta - Wikipedia
Orioles lower their magic number in the AL East to 1 with a 5-1 victory over the Nationals - Newsday
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Jake Arrieta announces retirement from baseball after 12 seasons, says 'It's just my time' - ESPN
Jake Arrieta, Major League Baseball, News, Scores, Highlights, Stats, and Rumors
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Jake Arrieta - Wikipedia
Has Jake Arrieta Worn Out the Patience of the Orioles? - Camden Chat