"I think it's a manifestation of the confidence that Buck (Showalter) and the coaching staff have in me," he said. "I'm pleased to be out there. It's a great feeling to be out there with your team on the first game of the season, being out there battling and trying to start the season off on a good note. I'll be very excited to have that opportunity."
Guthrie didn't show up at camp assuming that he was the No. 1 starter or that he was competing for it.
"I didn't think either of those things," he said. "I always show up at camp hoping to be in shape and get ready to have a good season. Where I'll pitch in the rotation never factors into the preparation or the thought process."
Here's the Pirates lineup for tonight's game:
Andrew McCutchen CF
Jose Tabata LF
Lyle Overbay 1B
Neil Walker 2B
Pedro Alvarez 3B
Garrett Jones RF
Ronny Cedeno SS
Chris Snyder C
Ross Ohlendorf RHP
The Orioles have 39 players on their 40-man roster with Adrian Rosario's removal earlier today.