I could have gone on forever creating statistics for baseball players, team standings, league standings and so on. Baseball fans are very meticulous about keeping track of everything. I finally compiled the most common statistics from several sources (mlb.com, Yahoo, Wikipedia, other sports sites) and pulled them into one model.
I liked how Vicki broke off the stats for golfers into its own class, so I followed that model for baseball players. I didn't follow that for Teams, and maybe that's not ideal.
I assumed that properties common to sports concepts like Game, Athlete, or Team could be inherited (weight, birthday, first drafted, date, etc.)
Statistics could be split further into batting and pitching.
Class: SportsPlayer
subClass: BaseballPlayer
property: positionPlayed [enumeration]
pitcher
catcher
first baseman
second baseman
third baseman
shortstop
left fielder
center fielder
right fielder
property: bats
right/left
property: throws
right/left
subClass: BaseballPlayerStats
property:atBat
property:basesStolen
property:battingAverage
property:gamesPlayed
property:homeruns
property:RBI
property:runs
property:runsAllowed
property:saves
property:strikeouts
property:walksAllowed
property:walksTaken
property:onBasePercentage
subClass: BaseballCoach
property: baseballCoachPosition
isa: Batting Coach
Class: SportsTeam
subClass:BaseballTeam
property:coachedBy [BaseballCoach]
property:league [BaseballLeague]
property:roster [BaseballPlayer]
property: division [BaseballDivision]
property: wins
property: losses
property: ties
property: homeWins
property: homeLosses
property: awayWins
property: awayLosses
Class:SportsGame
subClass:BaseballGame
property:homeruns [Integer]
property:runsScored [Integer]
property:strikes [Integer]
property:roster [BaseballPlayer]
property:basesStolen
property:homeruns
property:runs
property:runsAllowed
property:saves
property:strikeouts
property:walksAllowed
property:walksTaken
subClass:BaseballGameInning
property:inningNumber
property:atBat [BaseballPlayer]
property:pitchedBy [BaseballPlayer]