When analyzing a tennis player's performance, key statistics to focus on include win-loss record, which provides an overall indication of success; serve statistics such as first serve percentage, aces, and double faults, indicating serving proficiency; return statistics including break points converted and return games won, shedding light on returning ability; and groundstroke metrics like winners versus unforced errors, reflecting consistency and aggression. Additionally, examining performance on different surfaces (hard court, clay, grass) can reveal adaptability, while rankings and head-to-head records against top opponents provide context for competition level. Collectively, these statistics offer a comprehensive view of a player's strengths, weaknesses, and overall competitiveness.