Flexen didn't factor into the decision during Monday's 4-3 loss to Houston, allowing two runs on eight hits and two walks with four strikeouts in 5.2 innings.
The Astros jumped on Flexen early with two runs in the first, but the 27-year-old prevented any more from scoring despite considerable traffic on the bases. He departed down 2-1 with two out and a runner on second in the sixth but was erased from the final line when Seattle took the lead in the bottom of the inning. Flexen concludes a successful August with a 2-0 record and 2.68 ERA in 37 innings across six starts.