5:33 PM - Isaac Mattson (PIT) Pirates outrighted Mattson to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.

5:13 PM - Isaac Mattson (PIT) Pirates selected Mattson was selected from Triple-A Indianapolis on Thursday, Noah Hiles of the Pittsburgh Post-Gazette reports.

5:47 PM - Isaac Mattson (PIT) signed a minor-league contract with the Pirates on Dec. 11.