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Pirates reliever Isaac Mattson is 'happy to be back at the highest ...
Pirates recall former Pitt, Washington Wild Things pitcher Isaac Mattson
Back in the show: Harbor Creek grad Isaac Mattson joins the Pirates
Harbor Creek grad Isaac Mattson called up by Pirates after being …
Former Wild Thing Isaac Mattson Called Up by Pirates
Pittsburgh Pirates Revamp Bullpen: Isaac Mattson’s Exciting Return
Harbor Creek grad Mattson called up by Pirates - Yahoo
Pittsburgh Pirates promote their minor league pitcher of the year Isaac …
Pittsburgh Pirates Make Roster Moves at Pitcher - Sports Illustrated
Pirates minor league pitcher Isaac Mattson working to return to …