The batter swings and is able to connect with the inside breaking ball from the pitcher. The contact is solid enough to have the ball bloop into shallow left field. Unfortunately, the defense was aligned perfectly for this situation and the left fielder runs up for a sliding grab. The batter is out.
Somewhere else that day, another batter connects on an inside breaking ball and hits a blooper into the exact same spot in left field. But the defense was set up a bit further back and this left fielder is a just tad slower. The ball drops in front of the left fielder for a single. The batter is safe at first.
The batters did the exact same thing in both situations but there were two different results. Maybe the first batter was unlucky. Maybe the second batter got lucky. Regardless, there is an element of luck once the ball hits the bat. Some batters get more lucky than others during one season and they reap the benefits of the extra hits. Using three valuable statistics, we can help determine who got more of those lucky extra hits and who did not in a season.
- BABIP - This is a player's batting average on all balls hit into the field of play. League average BABIP is typically around .290 and generally those above or below that were affected by luck.
- xBABIP - However, a player can control his BABIP by the types of balls he hits (line drives create more hits for example) and how speedy he is (faster players generate more hits on batted balls). Their expected BABIP may be quite different than the league average of .290. We can calculate a player's expected BABIP by looking at their batted ball profile.
- xAVG - Taking that player's xBABIP, we can determine their expected AVG in a season. Comparing this to their actual AVG lets us know exactly how lucky each batter was.
Let's compare some of the AVG's and xAVG's from 2013 to see who might be due for a decline or improvement in 2014.
Players Due For A Decline In AVG
Players Due For An Increase In AVG
Curious about other players' xAVG from 2013? Of course you are. Check out my spreadsheet with the xAVG for hitters in 2013. You can also see what their xAVG difference was last year to see if they might be establishing a trend of outperforming their AVG.