A player not exactly known for having tenacity to match his elite talent came through with a clutch performance likely to change perceptions of him as a competitor. The right-hander who was expected to miss his start because of an illness again dominated, giving up three hits and striking out 12 in seven scoreless innings. That's nothing to sneeze at. Strasburg's fastball climbed as high as 96 mph, but his changeup was the pitch that made Wednesday night a sleepless one for the Cubs.