Chen, expected to pitch two innings, is already slotted into the Royals' starting rotation, so there's no urgency for him to perform well enough to win a spot. That was the situation last spring when Chen lost a battle for the last rotation spot to Luis Mendoza.
"The most important thing is to be ready for the season and there are some things I need to do -- first of all, I need to get my arm strength, I need to make sure I pound the strike zone, I need to make sure I have my fastball command," Chen said.
Duffy, on the other hand, would like a good showing because he's one of several pitchers competing for the fifth starting spot this year.
No word yet on the Rangers' starter.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.