Which really just underscores how ridiculously good this rotation is. Morton, who went 14-7 last season with a 3.62 ERA is their fifth starter. Guys who were important parts of their rotation last year are either gone or in the bullpen like Brad Peacock and Collin McHugh. Those guys would likely start for many MLB teams.
And here's some trivia for you. Which Astros pitcher threw the most innings last season? Don't know? Well, it was Mike Fiers with 153 innings. Remember him?
In the first five games of the season, the Astros starters have allowed a total of six runs. Six. Three of them came off Keuchel, who had a mediocre, but not terrible, start against the Rangers in the Astros' only loss. Two came from Lance McCullers, Jr. McCullers still shredded the Rangers with ten strikeouts. He was followed by Gerrit Cole on Sunday, the newcomer who may have had the best outing of the bunch with one run and two hits allowed in seven innings with 11 strikeouts. Verlander and Morton, of course, allowed zip in six innings apiece.
Let's put that all together, shall we?
Staff Hits Allowed: 20
Total Strikeouts: 36
Total Walks: 9
Quality Starts: 5
Combined ERA: 1.78

This rotation also has at least a pair of potential innings hogs in Verlander and Cole. Verlander has failed to reach 200 innings just once in 12 seasons and Cole has done it twice in four full seasons in the majors. If Keuchel can stay healthy, he certainly has the potential to reach that number as well.
And this is a versatile crew with low-ball, groundout pitchers in Morton and Keuchel mixed in with hard throwing guys like Verlander and Cole. Then there is McCullers, who few argue has some of the filthiest stuff in baseball if he can stay healthy.
It may be early, but the rest of baseball should be on notice that this is a deep and talented rotation. There will be no gimmies one through five against the 'Stros, which makes dealing with this team's high powered offense all the more difficult. Good luck.