Roscoe Tanner has an impressive grass court record of 118–46 across 164 matches (72.0% — strong). A win rate of that calibre over 164 matches is a reliable indicator of genuine quality on this surface. Claimed 2 titles on grass: Australian Open-1, Sydney-2.

At Grand Slam level (Wimbledon): Roscoe Tanner has been outstanding — 58–20 (74.4%) across 78 matches. Winning more than 7 in 10 Grand Slam matches on grass is the benchmark of an all-time great on this surface.

4 finals reached on grass — won 2, lost 2 (solid 50% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on grass. 13 semifinals. 22 quarterfinals.

vs. Top 10 on grass: 9–12 (42.9%, 21 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall grass court profile.

By format on grass — best-of-five: 60–21 (74.1%); best-of-three: 58–25 (69.9%). Slightly better in five-set matches on grass — a positive sign for the Slams specifically.

Best season: 1979 — 10–2 (83.3%) from 12 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.