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I know that to calculate Pwos (probability of point won on oun serve ) for each player the following formula is used...

# P(no Fault) -The probability a player's first serve not faulting

# P(win/no Fault) -The probability a player will win the point if the first

service does not fault

# P(win/fault) -The probability a player will win the point on his second

serve

formula...

P(win) = P(noFault)P(win/noFault) + (1 - P(noFault))P(win/fault)

For an example

P(noFault) = 0,70

P(win/noFault) = 0,64

P(win/fault) = 0,55

P(win) = (0,70 * 0,64) + (1 - 0,70) *0,55 = 0,613

This is a global method for calculating Pwos for a particular player on a particular surface.

I know that to calculate the most correct (Pwos) for two players, in a particular match, on a particular surface,it is necessary that these players used to have personal meetings on the same surface.

please tell me how to use this fact that they used to play each other on this surface?

Sorry for my English

thanks in advance...