Manager Bo Porter plans to wait toward the end of spring training to announce the Astros’ starting rotation. Former Rice standout Philip Humber is on the verge of making his own announcement. The 30-year-old Humber threw his second consecutive strong Grapefruit League game, allowing one hit in four scoreless innings in the Astros’ 4-2 victory over the Washington Nationals on Thursday at Osceola County Stadium. Humber walked three and struggled with his command during his spring training debut Feb. 25 against Atlanta. But the veteran righthander has given up only three hits and one earned run during his last two starts. With the Astros’ March 31 regular-season opener a little [...]