Duffy started at third base and went 0-for-2 with two walks in Wednesday's 5-1 win over Oakland.
Duffy was added to the roster this week after the Rangers placed Josh Jung (wrist) on the 10-day injured list and Ezequiel Duran landed on paternity leave. Those two transactions open up third base for the righty-hitting Duffy, who got the start against a lefty Wednesday, Josh Smith and Jonathan Ornelas.