Stephen Strasburg shook off an illness and all doubts about his mettle to pitch seven dominant innings, Michael A. Taylor hit a late grand slam and the Washington Nationals beat the Chicago Cubs 5-0 on Wednesday to send their NL Division Series to a decisive Game 5. The teams packed up at Wrigley Field and headed back to Washington for Game 5 Thursday night. Kyle Hendricks starts for the Cubs after throwing seven sharp innings in a 3-0 victory over Strasburg in Game 1. Gio Gonzalez is the likely starter for the Nationals, with Max Scherzer lurking in the bullpen. Strasburg got sick after his terrific performance in the playoff opener on Friday, and the Nationals had planned to go with Tanner Roark even after a persistent rain washed out Game 4 on Tuesday. That led to a flurry of comments and criticism about whether the ace had the stuff to pitch in big moments. But Strasburg felt better when he woke up Wednesday and told manager Dusty Baker he wanted the ball with Washington’s season on the line.