HOUSTON — The Chicago Cubs’ hold on first place in the division is becoming tenuous. They dropped their series against the Houston Astros with a 2-0 loss Sunday at Daikin Park and have lost four of their last 10 games. The Cubs (49-35) completed their challenging stretch of 26 games in 27 days, including one postponement due to rain, with a 12-13 record. But the Milwaukee Brewers and St. Louis …
