"A Test of Mixed Strategy Equilibria: Penalty Kicks in Soccer."
"A Test of Mixed Strategy Equilibria: Penalty Kicks in Soccer." American Economic Review, v92 (September 2002): 1138-1151. (with Pierre-Andre Chiappori and Timothy Groseclose).
It's not published on the web, but I'm sure some of you with access to college resources can read it. This paper is by one of the top economists in the country.