Serve points won

Serve points won measures how often a tennis player wins the point when they are the one serving. It is the clearest single indicator of serve quality, distinct from coarser stats like aces or service games won.

The formula is serve points won % = points won on serve / total points served. Analysts usually split this into first-serve points won and second-serve points won, since the first serve is typically faster and less predictable while the second serve trades power for consistency to avoid a double fault; a player's gap between the two rates reveals how much risk they take on the first delivery. This differs from service games won, a binary outcome that can mask close, competitive games behind a simple "held serve" result.

Coaches, broadcasters, and bettors use serve points won to profile playing styles and to feed win probability model estimates, often alongside its return-side counterpart, break point conversion. Surface matters a great deal: serve points won is structurally higher on fast surfaces like grass than on slow clay, so raw comparisons across surfaces, or against weak opposition, without adjustment are a common source of misleading conclusions, and player-specific baselines like Tennis Elo rating help contextualize the numbers.