Before last week's start in New York, Stephen Strasburg noticed his curveball wasn't working the way he wanted it to. He made an adjustment and dazzled the Mets, limiting them to two hits in six innings. Five days later, Strasburg relied on it again. Against the Houston Astros, the 23-year-old looked unhittable for five innings, struggled in the sixth and watched his team score four runs after he was lifted for a pinch-hitter as the Washington Nationals beat the Astros 6-3 on Monday.