A 16 team round robin runs 15 rounds with 8 matches per round and 120 matches in total — every team plays every other team exactly once. With an even number of teams nobody sits out, so all 8 matches run at once if you have the courts.
Round 1: Team 1 vs Team 16, Team 2 vs Team 15, Team 3 vs Team 14, Team 4 vs Team 13, Team 5 vs Team 12, Team 6 vs Team 11, Team 7 vs Team 10, Team 8 vs Team 9
Round 2: Team 1 vs Team 15, Team 16 vs Team 14, Team 2 vs Team 13, Team 3 vs Team 12, Team 4 vs Team 11, Team 5 vs Team 10, Team 6 vs Team 9, Team 7 vs Team 8
Round 3: Team 1 vs Team 14, Team 15 vs Team 13, Team 16 vs Team 12, Team 2 vs Team 11, Team 3 vs Team 10, Team 4 vs Team 9, Team 5 vs Team 8, Team 6 vs Team 7
Round 4: Team 1 vs Team 13, Team 14 vs Team 12, Team 15 vs Team 11, Team 16 vs Team 10, Team 2 vs Team 9, Team 3 vs Team 8, Team 4 vs Team 7, Team 5 vs Team 6
Round 5: Team 1 vs Team 12, Team 13 vs Team 11, Team 14 vs Team 10, Team 15 vs Team 9, Team 16 vs Team 8, Team 2 vs Team 7, Team 3 vs Team 6, Team 4 vs Team 5
Round 6: Team 1 vs Team 11, Team 12 vs Team 10, Team 13 vs Team 9, Team 14 vs Team 8, Team 15 vs Team 7, Team 16 vs Team 6, Team 2 vs Team 5, Team 3 vs Team 4
Round 7: Team 1 vs Team 10, Team 11 vs Team 9, Team 12 vs Team 8, Team 13 vs Team 7, Team 14 vs Team 6, Team 15 vs Team 5, Team 16 vs Team 4, Team 2 vs Team 3
Round 8: Team 1 vs Team 9, Team 10 vs Team 8, Team 11 vs Team 7, Team 12 vs Team 6, Team 13 vs Team 5, Team 14 vs Team 4, Team 15 vs Team 3, Team 16 vs Team 2
Round 9: Team 1 vs Team 8, Team 9 vs Team 7, Team 10 vs Team 6, Team 11 vs Team 5, Team 12 vs Team 4, Team 13 vs Team 3, Team 14 vs Team 2, Team 15 vs Team 16
Round 10: Team 1 vs Team 7, Team 8 vs Team 6, Team 9 vs Team 5, Team 10 vs Team 4, Team 11 vs Team 3, Team 12 vs Team 2, Team 13 vs Team 16, Team 14 vs Team 15
Round 11: Team 1 vs Team 6, Team 7 vs Team 5, Team 8 vs Team 4, Team 9 vs Team 3, Team 10 vs Team 2, Team 11 vs Team 16, Team 12 vs Team 15, Team 13 vs Team 14
Round 12: Team 1 vs Team 5, Team 6 vs Team 4, Team 7 vs Team 3, Team 8 vs Team 2, Team 9 vs Team 16, Team 10 vs Team 15, Team 11 vs Team 14, Team 12 vs Team 13
Round 13: Team 1 vs Team 4, Team 5 vs Team 3, Team 6 vs Team 2, Team 7 vs Team 16, Team 8 vs Team 15, Team 9 vs Team 14, Team 10 vs Team 13, Team 11 vs Team 12
Round 14: Team 1 vs Team 3, Team 4 vs Team 2, Team 5 vs Team 16, Team 6 vs Team 15, Team 7 vs Team 14, Team 8 vs Team 13, Team 9 vs Team 12, Team 10 vs Team 11
Round 15: Team 1 vs Team 2, Team 3 vs Team 16, Team 4 vs Team 15, Team 5 vs Team 14, Team 6 vs Team 13, Team 7 vs Team 12, Team 8 vs Team 11, Team 9 vs Team 10
The circle method pairs the 16 entrants across two rows, then holds one fixed and rotates the rest one position per round. After 15 rotations every pairing has happened once, which is why the total is 120 matches (16 × 15 ÷ 2).
At about 15 minutes per game to 11 points, 15 rounds take roughly 225 minutes, provided all 8 matches of a round run at once. With half the courts, double the estimate.
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