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Restrict results to one tour. Each value covers its singles and doubles draws, so atp includes ATP doubles and juniors covers the boys' and girls' Grand Slam draws. Omit for all tours. An unrecognised value is a 400 rather than a silent pass-through, so a caller never receives a tour it did not ask for. Applied before pagination, so meta.count reflects the filtered set.

Draw filter (added 2026-08-18) — the axis the tour filter deliberately collapses; the two compose (?tour=itf&draw=doubles is the ITF doubles slice). Same vocabulary as the draw field on Match, decided by the same shared definition, so filter and field cannot disagree. A row whose draw is null — a team tie, or no stated event type and no doubles-team participant — matches NEITHER value: null is an answer, not a wildcard. Two honesty notes: on /tournaments the answer comes from the event type alone (a tournament row has no participants to supply the doubles-team evidence matches have), and draw=doubles alone also returns mixed and exhibition doubles that no tour value reaches. An unknown value is a 400 bad_draw with the allowed values.

Return only matches in the QUALIFYING draw (true) or only those the source states are not (false), matching the is_qualifying flag each row carries (field added 2026-08-12, filter added 2026-10-02). Omit for both. Anything other than true/false is a 400 bad_is_qualifying, never a silently ignored filter. THIS IS THE ONLY WAY TO SPLIT THE TWO DRAWS, and the reason is in the is_qualifying field description: the two are routinely carried under ONE tournament name with ONE round vocabulary, so tournament, tournament_id, round and round_code all read main-draw for a qualifying match. Do not filter on the round text. THREE-VALUED, so this filter is too: a row whose flag is null (no source has ever stated it) matches NEITHER value and is returned only when the filter is omitted. null is an answer, not a false — returning it under is_qualifying=false would assert "main draw" on the strength of nothing. Measured 2026-10-02 over completed matches: the flag is stated on 98.9% of the last 30 days and 98.3% of 2026 outside the UTR circuit, where it is mostly unstated (1,695 of the 1,831 unstated rows in the last 30 days are UTR).

Return only men's or only women's matches, matching the gender field each row carries (added 2026-09-09, documented here 2026-10-02). Omit for both. Anything other than men/women is a 400 bad_gender, never a silently ignored filter. It exists because ?tour= deliberately collapses: challenger is ATP Challenger AND WTA 125, and itf and juniors are both sexes — so without this there is no way to ask for men's Challenger at all. A row whose gender is null (mixed doubles, a team tie) matches NEITHER value, the same contract as ?draw= and ?is_qualifying=. bad_points_complete, bad_combination, points_read_disabled, bad_after_seq, bad_has_market, no_market, points_disabled,