SCOTTSDALE, Ariz. -- The D-backs announced that they agreed to terms with 15 pre-arbitration-eligible players and renewed the contracts of four others Saturday.

The moves mean the D-backs have all players on the 40-man roster under contract for the 2012 season.

Players agreeing to terms on one-year deals were: Sam Demel, Barry Enright, Daniel Hudson, Brett Lorin, Yonata Ortega, Bryan Shaw, Zach Kronecke, Wade Miley, Joe Paterson, Mike Zagurski, Konrad Schmidt, Craig Tatum, Cole Gillespie, David Winfree and Paul Goldschmidt.

Josh Collmenter, David Hernandez, Ian Kennedy and Gerardo Parra had their contracts renewed for 2012.

D-backs, Bauer pleased with prospect's debut

SCOTTSDALE, Ariz. -- It's hard to imagine that Trevor Bauer's debut could have gone much better than it did Saturday.

The right-hander, who was the D-backs' top pick (No. 3 overall) in last year's First-Year Player Draft, retired all six hitters he faced, two by strikeouts, in throwing 22 pitches. Bauer looked impressive right from the start when he caught Rockies leadoff man Dexter Fowler looking for a called third strike on a big curveball.

"I think I threw it pretty well today," Bauer said. "That's always been my best breaking pitch. I've had the best feel for it, been throwing it the longest, so I was pleased with where that's at. I was pleased with attacking the zone. That's always my goal, to get ahead of guys and force them to swing the bat. If I can throw four pitches or less every guy I face, it keeps my pitch count down, and that's my goal for every hitter. I think I did all that today."

Bauer started in place of Tyler Skaggs, who was scratched after developing some shoulder tenderness last week.

"For a guy who probably had some emotions to deal with out there, some of his secondary pitches were actually better than any time that he's thrown so far," D-backs manager Kirk Gibson said. "He threw good."

Bauer, who was used to pitching in big games at UCLA, did not appear to be fazed by facing big league hitters for the first time.

"At the core level you throw strikes and they're hitters. They've still got to hit it, so it was more of a competition against myself as it always is to see if I can execute pitches," Bauer said. "It was fun; it was baseball again. It's been awhile since I've gotten to be on the field, so it was enjoyable."

Bauer was 1-2 with a 5.96 ERA in seven pro starts for Class A Visalia and Double-A Mobile last year after signing July 25. He is expected to start the season in the Minors, but certainly figures to be in the big leagues sooner rather than later.

Skaggs gives thumbs-up on shoulder

SCOTTSDALE, Ariz. -- Tyler Skaggs played catch Saturday and pronounced his left shoulder good to go.

The D-backs scratched the uber-prospect from his start Saturday after he experienced some tenderness in his shoulder Thursday.

"Just precautionary," Skaggs said Saturday. "I could easily pitch today."

Skaggs played catch from 100 feet Friday and had a brief flat-ground session where he threw his curveball and changeup, and he is scheduled to throw a bullpen session Sunday.

"I've just thrown a lot," Skaggs said. "Spring Training is stressful; you throw a lot. I didn't really warm up before we did some pickoff plays [Thursday]. Nothing really to worry about, to tell you the truth."

D-backs manager Kirk Gibson said he was not sure when Skaggs would be slotted back into the rotation.

Blum coping with persistent knee pain

SCOTTSDALE, Ariz. -- Geoff Blum is just going to have to live with the nagging discomfort in his right knee.

The 38-year-old lacks cartilage in the knee, and when he irritated it last spring, it kept him on the shelf for the first 92 games of the season. Blum reported to camp this year having shed 10 pounds in an effort to take even more pressure off the knee.

"It's always going to be there," he said of the discomfort. "It's just a matter of dealing with the pain and not letting it get any worse. It should be great if it stays like this."

The D-backs signed Blum to a two-year contract prior to last season and he was expected to see significant time at third base. But the knee problem and a subsequent fractured right pinkie caused him to miss a total of 127 games.

Blum, who has played in parts of 13 big league seasons, will decide at the end of the season whether he wants to continue playing.

"Obviously this is the end of my contract so at the end of the year we'll have to re-evaluate where we are as a family," he said. "We'll see. Last year was not the way I want to go out."