SAN FRANCISCO -- When the D-backs decided to keep Rubby De La Rosa on the Opening Day roster, they said he had done all the learning he could at the Minor League level and whatever was left to be done would have to happen in the big leagues.
De La Rosa (2-1) allowed four runs (three earned) on nine hits over 6 2/3 innings.
"He just left too many pitches up," D-backs manager Chip Hale said. "Once he started pitching down, he had some success. He battled. He gave up four runs -- tonight it wasn't good enough, but he's getting better each time out. It's improvement."
De La Rosa was in trouble from the outset as Nori Aoki led off the bottom of the first with a double to left and scored when Joe Panik followed with a single.
"They came out hot out of the gates," Arizona catcher Tuffy Gosewisch said. "They were ready to go right from the first pitch. It might have surprised us in the first inning, but after that, I thought he settled down."