Perhaps, at least, according to the author of Freakonomics and his associates:

http://www.economist.com/businessfinance/displaystory.cfm?story_id=14587...

Do people who play games for a living behave as the theory predicts? Not according to a new paper* by Kenneth Kovash, of Mozilla, the organisation behind the Firefox web browser, and Steven (“Freakonomics”) Levitt, of the University of Chicago, who crunched the evidence from 3.1m pitches in Major League Baseball and 128,000 plays in the National Football League (NFL).

In baseball, fastballs were the most common type of pitch, making up 65% of the sample. However, batters enjoyed significantly more success against them, on average, than against other types. That implies pitchers sent down too many. Worse still for the theory, having thrown a fastball, a pitcher was less likely to throw another next time. Cutting down on fastballs and removing the correlation between pitches, the authors suggest, might be worth a couple of games a season—enough to help a team squeeze into the playoffs in a tight year.