Tim, The standard format as displayed on scoreboards at tennis grounds and via the media would be ideal.
example:
Murray 1 0 1 0 40
Nadal 0 1 0 1 15
To save space we could eliminate the player name. Top player would be index 1.
Also it would be ideal to allow sufficient columns for up to 5 sets to cater for the 4 grand slam
tournaments namely French Open, Wimbledon Open, US Open and Australian Open.
This should not be too difficult for Betfair and MFP to implement. Betfair will no doubt capture this data in real time and just a matter of them playing ball with their API contractors.
R