Masset has been on the disabled list all year with a slight tear in his throwing shoulder.
"It's a situation like you're starting to throw again after the offseason -- three months off, whatever. You've got to get the rust out," Masset said. "Overall, I felt good. I thought the ball was coming out OK.
"There was a little something (as far as pain). I knew that there was going to be a little something going into it today, but I think it went well for the first day."
Reds manager Dusty Baker watched the session.
"He looked pretty good for his first time throwing the ball," Baker said. "He felt a little something, which is natural. ... He got a little better as he went on."
Masset last tried to throw in late April, when he had to shut it down after five pitches.
"I'm about as encouraged as I could be throwing the first day," Masset said. "We're still a long ways away. I try to stay positive, work as hard as I can in the training room, hope all that training and strengthening turns into good results."
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