According to the Elias Sports Bureau, Billy Wagner has allowed the fewest number of baserunners per nine innings over the course of his career than any other player since 1920.
Billy Wagner allowed only 7.88 baserunners per nine innings last season, the lowest against any pitcher in the majors. That's a Wagner specialty. His career rate of 9.27 runners permitted every nine innings is the lowest vs. any major-league pitcher in the live-ball era (which dates back to 1920). The three best (minimum: 500 innings): Wagner, 9.27; Trevor Hoffman, 9.54; Pedro Martinez, 9.62.His career WHIP is 1.03 (9.27 / 9), which is absurd. (ESPN.com)