Jon Lester had undeniably good stuff yesterday. He featured a 95 mph fastball, threw his best changeup of the season and found strikeouts when he needed them.

Unfortunately, he also made two mistakes against the Texas Rangers. Mitch Moreland smacked the first to left field for a solo homer in the third inning, which Lester could live with. But the one he wants back is the two-run homer Nelson Cruz blasted to center in the sixth that erased a 3-1 lead in a game the Red Sox would lose, 4-3.

“I made two mistakes,” Lester said. “Against a team like that, in this ballpark, you can’t do that.”

After watching the Red Sox win his first five starts, Lester has now taken no-decisions in two straight losses. The last one, in Toronto, was Lester’s worst game of the season. This was a marked improvement on that, with the left-hander allowing five hits and three runs in six innings, striking out seven and walking three.

But given the chance to outduel Rangers righty ace Yu Darvish, who struck out 14, Lester faltered.

“They’re all tough (losses) regardless of the situation or series,” Lester said. “A loss is a loss. Like I said, the guys did a good job early on of giving me that lead, and I’ve got to do a better job of minimizing damage, and I didn’t do that in the sixth.”