How do you schedule a round robin doubles tennis event for 20 players?

Answer:

assuming 20 players make a set of 10 X 2, make a group of 5 each.

then make group A and B, make them play against each other in a round robin league, top two teams from each group, qualify for semis, and then finals.

Group A topper plays group B second place

Group B topper plays group A second place.

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