SAN DIEGO (AP) — The Colorado Rockies stumbled again as they try to protect their tenuous hold on the NL's second wild card, losing 3-0 Thursday night to a San Diego Padres team powered by veteran left-hander Clayton Richard and rookie slugger Christian Villanueva. Richard (8-14) struck out eight in 7 1/3 scoreless innings a day after agreeing to a two-year contract extension through 2019, and Villanueva homered for the second straight game and drove in two runs. It was the fourth straight loss and sixth in eight games for the Rockies.