CHICAGO (Interstat) — Christian Walker homered twice and drove in three runs as the Houston Astros shut out the Chicago Cubs 3-0 on Saturday afternoon at Wrigley Field. Walker connected on a two-run shot in the first inning off Colin Rea and added a solo homer in the fourth. Kai-Wei Teng pitched six innings, allowing two hits and no earned runs with six strikeouts to improve to 3-3. Bryan King earned his sixth save, striking out one in a perfect ninth. Rea took the loss, giving up three runs on four hits over seven innings with four strikeouts, falling to 4-3. The Astros collected six hits, while the Cubs managed three. Attendance was 40,017, and the game lasted 2 hours, 18 minutes. Houston, which also won the series opener Friday, improved to 22-31, while Chicago dropped to 29-23.