David Nalbandian has an impressive career record of 383–192 across 575 matches (66.6% — strong). A win rate of that calibre over 575 matches is a reliable indicator of genuine quality. With 11 titles, among the most prolific champions in the Open Era: Masters Cup, Estoril, Basel, Munich and 6 more.
At Grand Slam level (Australian Open, Roland Garros, Wimbledon, US Open): a positive 86–36 (70.5%) across 122 matches — a player who generally rises to the occasion at the Slams.
ATP Masters 1000 (Indian Wells, Miami, Monte Carlo, Madrid, Rome, Canada, Cincinnati, Shanghai, Paris): a positive 113–69 (62.1%) across 182 matches — winning above .500 at this level, week in week out, is a genuine sign of quality.
23 finals reached — won 11, lost 12 (48% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 41 semifinals. 70 quarterfinals.
vs. Top 10: 35–60 (36.8%, 95 matches). Top 10 opponents have represented a clear ceiling; addressing that deficit is the single biggest lever for improving the overall record.
By format — best-of-five: 111–45 (71.2%); best-of-three: 272–147 (64.9%). Slightly better in five-set matches — a positive sign for Grand Slam campaigns specifically.
Dominant season: 2005 — 44–19 (69.8%) from 63 matches. That year represents a level of dominance that sets the ceiling for what David Nalbandian can produce.