Box score Dallas Keuchel was on for eight innings. The Astros’ hitters weren’t for all nine. The Astros’ starting lefthander threw eight frames of two-run ball Sunday before allowing four runs in the ninth. Lefty Martin Perez never let up, hurling a four-hit complete-game during the Rangers’ 6-1 victory in an American League West matchup at Minute Maid Park before an announced crowd of 22,922. The Rangers (68-50) captured their seventh consecutive win and the series. The Astros (37-79) have dropped five straight and are 1-9 in their last 10 games. Jose Altuve doubled down the right-field line with two outs and no one on base in the first inning. [...]