CINCINNATI (AP) -- Left-hander Aroldis Chapman hit 103 mph on the radar gun during another sizzling inning Wednesday night, then got his first big-league win when the Cincinnati Reds rallied for a 6-1 victory over the Milwaukee Brewers.

The Cuban left-hander threw two pitches that clocked 103 mph -- his fastest yet -- in his second straight unhittable performance.

The Reds stretched their NL Central lead to a season-high eight games over St. Louis, which lost to Houston 5-2. Cincinnati hasn't enjoyed such a big edge since 1995, the last time it reached the playoffs.

Ryan Hanigan's pinch-hit, three-run homer in the seventh off Todd Coffey (2-3) set up the Reds' three-game sweep.