SCOTTSDALE, Ariz. -- Top prospect Tyler Skaggs was scratched from his scheduled start Saturday due to some tenderness in the front of his left shoulder.

Skaggs had been slated to start against the Rockies at Salt River Fields, but fellow prospect Trevor Bauer will instead get the nod.

D-backs manager Kirk Gibson said Skaggs informed the training staff Thursday of the tenderness and that by Friday he was feeling better. Still, the team decided to err on the side of caution.

"It's really us," Gibson said. "He's probably fine, but I just know he's going to out there tomorrow on Opening Day and be jacked up. I appreciate him telling us about it. It's gone away immediately, they worked on him and he felt great today."

Skaggs will throw a bullpen session Sunday.

D-backs may try to lock up pair of aces

SCOTTSDALE, Ariz. -- Now that the D-backs and catcher Miguel Montero have agreed not to talk about a contract extension until the end of the season, might the club turn its attention to getting deals done with pitchers Ian Kennedy and Daniel Hudson?

It seems possible, as D-backs president/CEO Derrick Hall said on an chat Thursday that "we also let [Montero's] representatives know that there are other players we would like to engage with regarding multiyear deals."

Both Kennedy and Hudson said recently that they would be open to listening, and both pitchers live year-round in the Phoenix area.

General manager Kevin Towers was asked specifically about Kennedy and Hudson on Friday.

"I don't really want to get into the names," Towers said. "We've got several guys here that we've talked [internally] about. We haven't engaged any of them as of yet, but that's not to say that at some point in time at least seeing if there's some common ground there, but once the season starts we want these guys focused. We think a lot of Daniel, we think a lot of Ian. We haven't had any discussions with any of their advisors as of yet."

Kennedy is eligible for salary arbitration after this season, while Hudson will likely come up just short of having enough service time to be eligible.

Towers said in general he is more apt to sign a position player to a multiyear deal before his arbitration years than a pitcher, but there are exceptions to that.

"When they're young and still in their prime, there's probably less risk for injuries than when they get into their 30s," Towers said. "If you're able to at least get them through the arbitration process and maybe a year of free agency, well, that's one less thing that you have to deal with and they have to deal with. Sometimes it's a win-win for both sides.

"The two pitchers you're talking about are in great shape, take good care of themselves, probably less risk with those two guys just because of the individuals they are. They do their due diligence in the clubhouse, the weight room, in keeping themselves in shape, both in season and in the offseason."

D-backs sell out first two spring SRF games

SCOTTSDALE, Ariz. -- The D-backs' games at Salt River Fields this weekend are sold out.

Arizona will be the visiting team Saturday against the Rockies at SRF and Sunday the D-backs play host to the Giants.

Tickets still remain for both of the team's mid-week home games next week at SRF. Tuesday afternoon the Rangers visit for the lone time this spring, while Wednesday afternoon features a game against the Indians.

Limited tickets are still available for the team's first night game of the spring, March 10 against the Mariners. The game begins at 7:10 p.m. MST.

This is the D-backs' second season at SRF. Last year they led the Majors in Spring Training attendance when they drew 189,767, an average of 11,161 for 17 games.

SRF is the first Major League Baseball facility to be built on Native American land.