Rookie Jake Irvin struck out five in 6 1/3 innings and earned his first career victory, leading the Washington Nationals to a 5-1 win over the San Francisco Giants on Monday night. Making his second career start and first on the road, Irvin didn't give up a run in a dominant outing for the Nationals, who are in last place in the NL East. The 26-year-old right-hander limited the Giants to four hits and was backed by a defense that turned double plays in three of the first four innings.