MEXICO CITY — Kyle Tucker and the Houston Astros had a very successful stay in Mexico City. Tucker, Jose Altuve and Jeremy Peña each hit a solo homer, helping Framber Valdez and the Astros beat the Colorado Rockies 8-2 on Sunday. Tucker and Yainer Diaz each drove in two runs as Houston swept the two-game series at Alfredo Harp Helú Stadium. “The plan was to use the series as a springboard looking forward,” Astros manager Joe Espada said.