Ryu appeared comfortable making 20 pitches as planned, and his fastball was livelier than might be expected considering the inflammation that resulted in a cortisone injection.
The club is cautiously optimistic Ryu will be able to start Game 3 of the National League Division Series on Monday, Oct. 6, on the road. Clayton Kershaw and Zack Greinke are expected to start Games 1 and 2 at home, but Mattingly would not confirm that on Friday.
Ryu missed three weeks with similar inflammation earlier this year.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.