Texas Rangers right-hander Alexi Ogando has added an element of uncertainty into the construction of the Rangers’ rotation. Ogando, projected as the fourth starter in his return from the bullpen, had his second consecutive uneven performance Wednesday. He allowed five of the 11 hitters faced to reach base and gave up two unearned runs in two innings during an 8-4 loss to the Chicago White Sox. In his two outings, Ogando has allowed 10 base runners in 3 1/3 innings. The telling fact is he has struck out only one of the 18 hitters he’s faced. In his major league career, Ogando has averaged a strikeout every 4.8 hitters faced. “You want to see execution,” manager Ron Washington said. “We know what Ogando has to offer. Right now, he’s not where he should be.” Ogando to date has had little opportunity to work on a changeup, which he needs as a starter. He has had difficulty with his top two pitches: fastball and slider. He has lacked command of the fastball, and the slider has not been his strikeout-inducing slider. “I felt a little bit better than the last time,” said Ogando, speaking through an interpreter. “When I have my fastball, I have my changeup. But if I can’t locate my fastball, I don’t really feel good, and my changeup doesn’t come easy. “Gradually, I think it’s going to get better. I’m working on it, but I have to work harder to get everything done. I need more days, more time.”