ollinger
G.O.A.T.
I haven't thought through the logistics of the round robin entirely, but as each player plays 3 matches in the round robin, would it be feasible to do it somewhere where each player could play those round robin matches on hard, clay and grass courts, sequentially. Everyone plays one match on each surface. For the semi final and final matches, the player with the better record in the tournament (fewest sets lost, fewest games lost, whatever tiebreaker you want to use), would choose the surface. No more whining about what surface the tournament is played on, and players would have incentive to play every match at full speed instead of laying back for a better semi match-up.