Guillermo Vilas has an impressive hard court record of 107–46 across 153 matches (69.9% — strong). A win rate of that calibre over 153 matches is a reliable indicator of genuine quality on this surface. 4 titles on hard: Fort Worth WCT, Johannesburg-2, Basel, Hobart — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Australian Open & US Open): a positive 22–9 (71.0%) across 31 matches — a player who generally rises to the occasion at the Slams on hard.

9 finals reached on hard — won 4, lost 5 (44% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 15 semifinals. 24 quarterfinals.

vs. Top 10 on hard: 3–11 (21.4%, 14 matches). Top 10 opponents have represented a clear ceiling on hard; addressing that deficit is the single biggest lever for improving the overall record here.

By format on hard — best-of-five: 21–14 (60.0%); best-of-three: 86–32 (72.9%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on hard.

Best season: 1977 — 14–1 (93.3%) from 15 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.

Guillermo Vilas put together an impressive 12-match winning streak on hard, highlighting the ability to maintain high performance across multiple tournament rounds and events.