De La Rosa was claimed off waivers by the Padres and optioned to Triple-A El Paso on Saturday. De La Rosa lost his spot on the Dodgers' 40-man roster earlier in the week after Hector Olivera's signing became official. The 25-year-old lefty struggled in six appearances with Triple-A Oklahoma City this season but turned in a 2.95 ERA in 36.2 innings with Arizona last season, albeit with a reverse platoon split (.233/.320/.302 vs. RHB, .309/.377/.418 vs. LHB).