Cool stat, thank you for sharing.
The average tour pro loses approx 3 balls over four rounds in Memphis and 2 balls in Houston.
That is a lot of water balls, I feel bad for the average player.
I quick check of the PGA tour stats, which doesn't list water balls, looks like approx 6-7 balls in green side bunkers per tournament.
That is a lot of hazards for the best players.