Duffy went 1-for-4 with a two-RBI triple in Thursday's win over the Mariners. Duffy has been feasting on Mariners' pitching in their four-game set, hitting .438 with a homer and four RBI. He is a must-own in leagues where he has middle infield eligibility, but his .293/.342/.448 slash line is even useful as a third baseman in most leagues.