General manager Jon Daniels said the Rangers believe Francisco suffered the injury after working out following three straight days of appearances and not because of the pitching workload. Daniels is hopeful Francisco may play catch Wednesday and possibly throw a bullpen session before the weekend. But Daniels also indicated the disabled list is a possibility.

Francisco, who has had two arm surgeries, including the Tommy John procedure in 2005, had not pitched on three consecutive days in major league games since 2007. He was asked to get a four-out save at Seattle on May 4. The next day, he warmed up three different times before entering the game with a five-run lead in the 10th inning. Manager Ron Washington indicated a desire to refrain from using Francisco a third day, but he still brought him in with a one-run lead May 6. He ended up throwing 52 pitches over the three-day span and has not been used since.

"We've got confidence in a lot of guys, but obviously he's a big part of what we are doing here," Daniels said. "Frankie seemed to think he hurt it working out. We're going to look at his shoulder maintenance program and see what we can do. We'll just have to look at that and how he prepares for games."

Francisco moved into the closer's job last Aug. 25 and has not allowed an earned run in that role, but his 27 1/3-inning streak pre-dates his promotion to closer. Francisco replaced left-hander Eddie Guardado, who replaced lefty C.J. Wilson after Wilson went on the DL last July to have bone chips removed from his elbow. Daniels said Washington is likely to use Wilson as his first option to close games in Francisco's absence, but the team could also try to mix and match relievers depending on the situation.

RANGERS 7, MARINERS 1: RHP Scott Feldman pitched into the seventh inning for the first time this year, extending the club's recent run of having its starter outlast the opponent. And when the Rangers do that, they are a very, very good team. While Seattle LHP Jason Vargas was making his first start of the season and thereby limited to 75 pitches, an allotment that got him only through five innings, Feldman held the Mariners scoreless through the first six. It was the 13th time in the last 16 games the Rangers starter has outlasted the opposition. When the team does that, it's 10-3. For the season, the Rangers are 14-7 when their starter goes deeper than the opponent's starter.