ARLINGTON, Texas -- Derek Holland never looked right on the mound for the Texas Rangers in their home opener. Now he won't be back there for at least six weeks - and maybe more.
Holland left the 5-1 loss to the Houston Astros after only one inning Friday with tightness in the back of his shoulder that was later diagnosed as a strained subscapularis muscle.
"I'm pretty beat up about this," Holland said. "I just wanted to make sure I got through the inning. To come out here and throw the first pitch and have it go down the drain like that crushes you. Personally it really sucks."
General manager Jon Daniels said Holland won't throw again until the muscle is healed. Even if the pitcher is good when another scan is done in four weeks, Holland would still have to rebuild his arm strength and do rehab before coming back.
The Rangers were already without ace Yu Darvish, who had Tommy John surgery last month.
Outfielders Shin-Soo Choo (back spasms) and Ryan Rua(sprained right ankle) also made early exits because of injuries. Choo was feeling better afterward, but Rua had a protective boot on his foot and could be headed to the disabled list.
Holland (0-1), who missed most of last season recovering from left knee surgery, felt the tightness on the last pitch he threw during warmups. The left-hander then gave up a single to Jose Altuve on the first pitch of the game, and his velocity was noticeably down.
"I thought he was throwing change-ups," shortstop Elvis Andrus said.
"The velocity below 90 (mph), and not typical of where Derek is normally at," said Jeff Banister, the Rangers manager who made his home debut. "We felt like that we needed to get in front of it."
Bass allowed one run in five innings. The right-hander had a defensive gem in the fifth when he had a diving backhanded stab to catch Robbie Grossman's popped-up bunt and turned that into a double play.
"Anthony Bass did a tremendous job and gave us exactly what we needed," Banister said.
Collin McHugh (1-0) pitched six solid innings, with four strikeouts while allowing one run, to win his eighth consecutive decision. He was 7-0 with a 1.77 ERA his final 10 starts as a rookie last season.
"That's the best way to win. When you have guys who can contribute every day," Lowrie said. "You don't have to rely on one person."
Lowrie hit a solo homer in the first off Holland. Rasmus had a two-run shot in the ninth of closer Neftali Felizpitching in a non-save situation.
No. 9 hitter Jake Marisnick had three of Houston's 10 hits and drove in two runs. The Astros totaled only three runs and eight hits in their season-opening, three-game series against Cleveland.