The right-hander threw a scoreless inning Sunday for Class A Tampa against Lakeland, walking one during his 20-pitch outing. On Saturday, Prior recorded a strikeout in a scoreless inning against Detroit's Class A team.
"That's when the secondary pitches come into play," Prior said, according to The Associated Press. "It was a step forward. My arm feels fine."
Prior's fastball reached 91 mph in both games and averaged around 90, the AP noted. Prior has said that he is willing to prove his health at the Minor League level and could be promoted to Triple-A Scranton/Wilkes-Barre later in the year. Prior can opt out of his Minor League contract in late June.
The AP also reported that right-hander Kevin Millwood is scheduled to make his second and possibly final extended spring start on Tuesday. The 36-year-old agreed to a Minor League deal on March 25 and is expected to be sent to Triple-A this month. He can opt out on May 1 if he is not added to the big league roster.