Inbaseball statistics,hits per nine innings (denoted byH/9) is the average number ofhits allowed by apitcher in a nine inning period; calculated as: (hits allowed x 9) /innings pitched.[1] This is a measure of a pitcher's success based on the number of all outs he records.
Compared to a pitcher'sbatting average against, a pitcher's H/9 benefits fromsacrifice bunts,double plays, runnerscaught stealing, andoutfield assist, but it is hurt by someerrors. Unlike batting average against, a pitcher's H/9 benefits from outs that are not related to official at bats, as they are recorded on runners after they have reached base.
As of June 2024[update],Nolan Ryan is the career leader (6.5553),Sandy Koufax is #2 (6.7916),Clayton Kershaw is #3 (6.8160).[2]
