DENVER — The Astros have outplayed the Colorado Rockies since the teams’ four-game interleague series began Monday. A victory Thursday during a 7:40 p.m. contest at Coors Field would give the Astros a 3-1 series win. Righthander Lucas Harrell (3-6, 5.43 ERA) starts against righty Juan Nicasio (4-1, 4.38). Harrell’s been highly inconsistent this season, alternately throwing some of the best outings of any Astros pitcher and failing to get through the second inning. The club’s No. 2 starter gave up six hits and six runs in just 1 2/3 innings during a home loss last Saturday to Oakland. The Astros are 6-7 in their last 13 games and are [.]