Guillermo Vilas has an impressive grass court record of 66–28 across 94 matches (70.2% — strong). A win rate of that calibre over 94 matches is a reliable indicator of genuine quality on this surface. Claimed 3 titles on grass: Masters, Australian Open.

At Grand Slam level (Wimbledon): a positive 42–17 (71.2%) across 59 matches — a player who generally rises to the occasion at the Slams on grass.

4 finals reached on grass — converted 3 into titles (outstanding 75% conversion rate). Converting finals at that rate separates champions from contenders. 7 semifinals. 10 quarterfinals.

vs. Top 10 on grass: 4–3 (57.1%, 7 matches). Winning above .500 against the world's best on grass is a benchmark of genuine elite quality on this surface.

By format on grass — best-of-five: 44–18 (71.0%); best-of-three: 22–10 (68.8%). Slightly better in five-set matches on grass — a positive sign for the Slams specifically.

Best season: 1978 — 11–2 (84.6%) from 13 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.

Guillermo Vilas put together an impressive 9-match winning streak on grass, highlighting the ability to maintain high performance across multiple tournament rounds and events.