Yes, Bazooka Joe Saunders is probably lucky to have given up just one run in five innings. No, he hasn't been nearly as impressive as Yu Darvis. And yes, you might reasonably argue that Saunders should have been yanked after he struck out Josh Hamilton to end the third inning; Buck Showalter could have brought in a capable right-handed pitcher to face the Rangers' righty-heavy lineup.
But this is baseball, and Saunders does have five solid innings in the books despite giving up six hits, thanks to three double plays already. And he's thrown only 72 pitches, which will make it awfully hard for Showalter to pull him now.
Meanwhile, Darvish has been outstanding. The run he allowed was unearned, and he's struck out five Orioles while allowing only two hits.
Which doesn't matter a bit. This is baseball. All it takes is one bloop followed by a blast, and everything that came before will be forgotten, like tears in the rain.