Marcos Giron has a competitive grass court record of 19–18 across 37 matches (51.4%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Claimed 1 title on grass: Newport.

At Grand Slam level (Wimbledon): Marcos Giron is 5–6 (45.5%) across 11 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

One final reached on grass, converted into a title — a perfect finals record on this surface. 1 semifinal. 5 quarterfinals.

vs. Top 10 on grass: 1–7 (12.5%, 8 matches). Top 10 opponents have represented a clear ceiling on grass; addressing that deficit is the single biggest lever for improving the overall record here.

By format on grass — best-of-five: 5–6 (45.5%); best-of-three: 14–12 (53.8%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on grass.

Best season: 2024 — 9–4 (69.2%) from 13 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.