Astros first baseman-designated hitter Brett Wallace, who was shipped back to Class AAA Oklahoma amid an 0-for-22, was thrown back in the starting lineup Tuesday in his first day back in the majors. “I think it’s extremely important,” manager Bo Porter said of Wallace’s opportunity. “Whenever you take a step back – and from an organizational standpoint he started the season as one of our starters and didn’t fare too well – and now you come back with an opportunity the second go-around. You want to make sure you seize the opportunity and move forward.” Wallace hit .326 with 16 doubles, 11 home runs and 37 RBIs with OKC to [...]