De La Rosa pitched a clean sheet on two hits and no walks while striking out two in 0.2 innings in the Diamondbacks' 8-3 loss to the Pirates on Saturday. De La Rosa has pitched two straight scoreless outings, allowing his ERA to descend to 2.77 on the season. Since being called up from Triple-A Reno, he has let up four runs in 11.1 innings. The 24-year-old has allowed a hit in nine of his 10 outings.