Here are some options for 24 players and 6 courts.
24 players 6 courts 5 rounds
( 7 17 v 11 9) (20 19 v 22 18) (24 12 v 13 16) (21 1 v 10 8) ( 5 15 v 3 14) ( 4 23 v 2 6)
( 3 4 v 13 18) (10 17 v 24 23) (21 12 v 14 20) ( 8 11 v 16 22) ( 9 5 v 19 2) ( 7 1 v 6 15)
(24 8 v 9 14) (18 15 v 21 23) ( 3 17 v 19 1) ( 4 5 v 16 20) (22 12 v 2 7) (11 10 v 6 13)
(22 10 v 15 4) ( 1 24 v 2 18) (20 11 v 3 23) ( 6 21 v 16 9) ( 5 17 v 12 8) (13 19 v 14 7)
( 1 12 v 23 9) (11 4 v 24 19) (10 7 v 16 3) (15 2 v 8 20) ( 6 17 v 14 18) (21 22 v 5 13)
24 players 6 courts 6 rounds (3 pairs of players who meet twice, once as partners, once as opponents)
( 7 24 v 6 9) (12 20 v 8 10) (23 17 v 1 11) (15 14 v 16 4) ( 3 22 v 5 21) (18 19 v 13 2)
(22 24 v 14 17) (11 18 v 4 10) ( 7 2 v 5 20) ( 3 12 v 23 19) ( 6 21 v 15 13) (16 1 v 9 8)
(12 11 v 16 2) ( 3 13 v 14 9) ( 1 7 v 10 22) (20 15 v 17 19) (18 8 v 24 21) ( 4 5 v 6 23)
(10 5 v 13 17) (22 1 v 6 2) (16 20 v 23 24) ( 8 19 v 11 14) (15 3 v 18 7) (12 21 v 4 9)
(11 5 v 24 15) ( 8 2 v 3 17) (16 6 v 19 10) ( 4 12 v 13 7) (21 14 v 1 23) ( 9 18 v 20 22)
( 4 1 v 24 19) ( 5 14 v 12 18) ( 8 23 v 13 22) (11 6 v 20 3) ( 2 9 v 15 10) (21 7 v 16 17)
24 players 6 courts 7 rounds (15 pairs of players who meet twice, once as partners, once as opponents)
(13 10 v 1 17) (11 2 v 6 20) ( 5 4 v 21 16) (15 12 v 19 24) ( 9 23 v 3 18) ( 7 14 v 22 8)
( 9 13 v 16 19) ( 3 24 v 21 20) ( 4 12 v 14 6) (15 2 v 1 7) (18 17 v 5 8) (11 22 v 10 23)
(16 6 v 7 15) ( 3 2 v 19 5) ( 4 9 v 1 11) (18 24 v 22 13) (12 21 v 8 23) (20 14 v 17 10)
( 6 21 v 18 1) (22 20 v 9 12) ( 3 11 v 17 14) (13 8 v 15 5) ( 7 19 v 10 4) ( 2 24 v 23 16)
( 1 22 v 3 16) (10 9 v 24 8) (12 11 v 5 7) ( 2 21 v 14 13) (15 20 v 18 4) (19 6 v 17 23)
(13 20 v 23 7) ( 5 24 v 1 6) ( 3 12 v 10 15) ( 2 22 v 17 4) (18 8 v 11 16) (14 21 v 9 19)
( 6 4 v 13 3) ( 9 24 v 7 17) (22 15 v 21 11) (23 14 v 5 16) ( 1 19 v 20 8) (10 12 v 2 18)