Duffey (1-0) pitched 1.1 innings in Saturday's 18-4 win over the Mariners, allowing one hit and striking out three batters to earn the win.
Starter Jose Berrios ran up a high pitch count, leaving Duffey as the pitcher of record in the blowout win. The 28-year-old right hander has a 3.72 ERA and 1.24 WHIP with 14 strikeouts over eight appearances (9.2 innings) this season. He'll continue to see the bulk of his usage in middle relief.