OFFICIAL BASEBALL RULES

Rule 9.21 to 9.22game. All such players, however, shall be credited with one gameplayed (in batting statistics) so long as they are announced into thegame or listed on the official lineup card.Rule 9.20 Comment: The official scorer shall credit a playerwith having played on defense if such player is on the field forat least one pitch or play. If a game is called (for example,because of rain) after a substitute player enters the field butbefore a pitch is thrown or a play is made, the official scorershall credit such player with a game played in the batting statisticsbut shall not credit such player in any defensive statistics.If a game is called (for example, because of rain) after arelief pitcher enters the field but before a pitch is thrown or aplay is made, the official scorer shall credit such pitcher with agame played in the batting statistics but shall not credit suchpitcher in any defensive statistics or with a game pitched.Any games played to break a divisional tie shall be included in thestatistics for that championship season.9.21 Determining Percentage RecordsTo compute:(a) Percentage of games won and lost, divide the number of gameswon by the sum of games won and games lost;(b) Batting average, divide the total number of safe hits (not thetotal bases on hits) by the total times at bat, as defined in Rule9.02(a) (Rule 10.02(a));(c) Slugging percentage, divide the total bases of all safe hits bythe total times at bat, as defined in Rule 9.02(a) (Rule10.02(a));(d) Fielding average, divide the sum of putouts and assists by thesum of putouts, assists and errors (which shall be called chances);(e) Pitcher’s earned-run average, multiply the total earned runscharged against such pitcher by 9, and divide the result by thetotal number of innings he pitched, including fractions of aninning; andRule 9.21(e) Comment: For example, 9 1 ⁄3 innings pitched and 3earned runs is an earned-run average of 2.89 (3 earned runstimes 9 divided by 9 1 ⁄3 equals 2.89).135