The plan is to shut Rupe down for about 10 days and let the inflammation subside before he starts throwing again. That means he won't break camp with the Rangers as their fifth starter but he shouldn't miss an extended period of time, either.
"We got as good of news as we could expect," Showalter said. "We're excited about it."
With Rupe out, Juan Dominguez gets to start on Friday against the Chicago White Sox in Tucson. Thomas Diamond is also scheduled to pitch on Friday.
Eaton throws simulated game:
Adam Eaton got his work in during a simulated game back in Surprise, throwing 63 pitches over four innings. Pitching to Minor League hitters, Eaton allowed three runs, one earned, on five hits. He struck out five.
Catcher Brian Valichka, a 19th-round draft pick in 2005, hit a home run off Eaton.
"He got his work in and his pitch count up," Showalter said. "He moved along the process of building arm strength."
Minor League outfielder Vince Sinisi was one of the extra players brought to Scottsdale for Tuesday's game with the Giants. A week ago he was in Florida, playing for Italy in the World Baseball Classic.
"I had a blast, it was one the best experiences I've had in baseball," Sinisi said.
Sinisi was born in Houston and went to Rice University, but played for Italy because of his Italian heritage. Mike Piazza also played for Italy.
"One of the greatest guys I've ever played with," Sinisi said. "He really opened up to us and was one of the guys. He treated us all like professionals. He talked strategy a little bit, pitchers that he had faced and knew, or pitchers I faced. He'd just sit there in the dugout and talk baseball."
Sinisi said he looks forward to doing it again in three years.
"If a guy like Piazza can do it after playing 18 years, there wouldn't be any reason not to do it," Sinisi said.
However, remember that Sinisi was a second-round pick, an All-American at Rice and a top hitting prospect. In future World Baseball Classics, he could be a multiple All-Star and batting champion who would be highly-coveted by both Team USA and Italy.
"I don't know, I'll deal with that as it comes," Sinisi said. "Right now I'm just trying to become one of those players."
Left-handed reliever Jesse Carlson has been sent back to the Minor Leagues. He had allowed three runs in four innings over three appearances. ... Laynce Nix was 2-for-4 on Tuesday, raising his spring average from .158 to .217. ... Hank Blalock is hitting .375 for the spring after going 2-for-2 against the Giants. ... The Rangers were 0-for-9 with runners in scoring position against the Giants. ... The Rangers won their first four games against the Giants since moving to Arizona four years ago but have now lost their last six. ... D'Angelo Jimenez had a two-run home run on Tuesday and now has an eight-game hitting streak.
Right-hander R.A. Dickey pitches against the Angels at 2:05 p.m. CT Wednesday in Tempe while Vicente Padilla, Francisco Cordero and C.J. Wilson will all pitch in a "B" game back in Surprise against the Kansas City Royals. Kevin Mench, who is 9-for-18 for the spring, is scheduled to be on the travel squad to Tempe.