Since I can't find the player who said that, and since that wasn't even my point, I'll do the next best thing, a little basic education on court speeds and how they affect play. So if it thrills you to say "got ya" on an obscure fact that is not my main point, good for you. Sorry if you don't get it, truly am;
The Sestée is able to measure the following:
Vix = horizontal inbound velocity (m/s)
Viy = vertical inbound velocity (m/s)
Vfx = horizontal outbound velocity (m/s)
Vfy = vertical outbound velocity (m/s)
e = coefficient of restitution (COR)
μ = coefficient of friction (COF)
T = mean ball temperature for test location/sample (°C)
c = temperature coefficient (0.003)
eT= adjusted COR for temperature T
a = pace perception constant (150)
b = mean coefficient of restitution for all surface types (0.81)
Category Court Pace Rating
Category 1: Slow ≤ 29
Category 2: Medium-slow 30-34
Category 3: Medium 35-39
Category 4: Medium-fast 40-44
Category 5: Fast ≥ 45
Tournament Surface Court Pace Rating
Indian Wells Plexipave IW Category 1: Slow
Miami Masters Laykold Cushion Plus System Category 3: Medium
Monte Carlo Masters Clay Category 1: Slow
Madrid Master Clay Category 1: Slow
Rome Masters Clay Category 1: Slow
Rogers Cup Pro DecoTurf II Category 4: Medium-Fast
Cincinnati Pro DecoTurf II Category 4: Medium-Fast
Shanghai Masters DecoColor Category 4: Medium-fast
Paris Masters Greenset Grand Prix Category 4: Medium-fast
ATP World Tour Finals Greenset Grand Prix Category 3 – Medium
Grand Slams
Grand Slam Surface Court Pace Rating
Australian Open Plexicushion Prestige Category 4 – Medium-Fast
French Open Clay Category 1 – Slow
Wimbledon Grass Category 3 – Medium
US Open Pro Decoturf II Category 4 – Medium-Fast
Masters 500 Tournaments
Tournament Surface Court Pace Rating
Rotterdam Greenset Grand Prix Category 3 – Medium
Rio Open Clay Category 1 – Slow
Dubai DecoTurf Category 3 – Medium
Acapulco Clay Category 1 – Slow
Barcelona Clay Category 1 – Slow
Halle Grass Unknown
Queens Grass Unknown
Hamburg Clay Category 1 – Slow
Washington DecoColor Category 4: Medium-fast
Beijing DecoTurf Category 3 – Medium
Tokyo DecoTurf Category 3 – Medium
Basel Greenset Grand Prix Category 3 – Medium
Valencia Clay Category 1 – Slow