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Tennis Surface Transfer
The most extreme clay-over-hard specialist in the ATP career snapshot is Luciano Darderi, a 0.4603 clay-minus-hard win-rate gap, 0.6825 on clay against 0.2222 on hard.
confirmednull (a finding)not testabledescriptivepending
Tennis Surface Transfer

What it means
Surface specialization is real and large for a few players but modest for most: across the 184 qualifying ATP-career players the median clay-minus-hard gap is only +0.0149, and 58.15% tilt at all toward clay. The women's combos are empty here, the sample-size floor eliminated every WTA player.
Caveats & confounds
Opponent strength is NOT controlled, so a gap partly reflects scheduling and seeding rather than surface skill alone; retirements count as decided matches; DESCRIPTIVE_ONLY, no forecast and no market or ROI edge.