ATP Open Era & Live Rankings

RANKING RULES AFTER 1984

The 1984 reform called for a simpler tournament star system. The ATP decided to give up on the tournament difficulty rating and gave more options for the draw size. At the same time, due to the continuous increase in prize money, stars gained for that were broken down in multiple parts, so tournaments ended up having less stars than before. An important modification referred to the way an average was calculated, the ATP deciding to go for a variable average, in which the divisor was changed the more tournaments a player participated in. As a final modification, the ATP decided to modify the bonus point system, so that players would get rewards for beating players inside of the Top 150 and more of them, especially for Top 20.

SYSTEM SPAN: 52-WEEK ROLLING SYSTEM [Tournaments counted for each player drop out of their breakdown 52 weeks after they enter the system]
SYSTEM TYPE: STAR BASED [Tournaments have different point weights according to the number of stars a tournament held. The stars were assigned according to rules described below]
POINTS: VARIABLE AVERAGE [Players receive points according to the round they are eliminated in. These points are added and players are ordered according to the average resulted from the total points being divided to a divisor. The divisor would change the more tournaments a player participated in. If that number was 13 or less, the divisor equaled the tournament number. Between 14 and 18, the divisor would be N-1 (where N is the number of tournaments), provided the player participated in at least 1 GP Regular Series Tournaments. Between 19 and 22, the divisor was N-2 or, if a player participated in less than 2 GP Regular Series tournaments, N minus the number of GP-RS tournaments. Between 23 and 26, N-3 (same GP-RS rule). More than 26, N-4 (same GP-RS rule).]
TOURNAMENTS: MINIMUM OF 12 [Players could count as many tournaments as possible, but the average was obtained from a minimum divisor of 12. Players with less than 12 tournaments obtained their average by dividing their total points to 12]
MINIMUM PRIZE MONEY: $25000

BASE RULES

All tournaments are counted immediately after they are finished (on the upcoming Monday). Some exceptions may occur with some Challenger tournaments, which will be marked as a late entry into the rankings. Another exception to this rule are Satellite circuits which are counted one week later after the Masters final tournament has been played. Once into the system, tournaments remain counted for 52 weeks.
The rankings are published every Monday of the year. Exception to this rule are the mid-Mondays of tournaments lasting for more than one week and weeks without any Grand Prix tournament. 1984 is the first year in which this rule was created, so that is why OER will not provide UNOFFICIAL rankings beyond this point towards the present day.
Players withdrawing before the first round is played will count the tournament to their average list, and late withdrawals will count as a penalty of 0 points (and tournaments counted for average).

TIES BEFORE JULY 1985

When two or more players have the exact same average, they will be considered ranked on the same position.

TIES AFTER JULY 1985

When two or more players have the exact same average, if they have 12 or more tournaments played, players would be ahead of the ones with less than 12 tournaments, and tied players would be separated by a yet-to-be-determined criteria.
When two or more players have the exact same average, if they have less than 12 tournaments played, players would be behind those with equal or more than 12 tournaments, tied players with less tournaments would be ahead of those with more tournaments, and if still tied, they would be separated by a yet-to-be-determined criteria.

STAR ASSIGNATION

Tournaments were given stars according to the following rules:

Prize Money Between $25000-$150000: Tournaments receive one star for each increment of $25000 in prize money.
Prize Money Between $150001-$500000: Tournaments receive 6 stars plus one star for each increment of $50000 in prize money.
Prize Money Between $500001-$1025000: Tournaments receive 13 stars plus one star for each increment of $75000 in prize money.
Prize Money Over $1025000: Tournaments receive 20 stars plus one star for each increment of $100000 in prize money.
Draw Size: 32 players - 0 Stars. 48 players - 1 Star. 56 players - 2 Stars. 64 players - 3 Stars. 96 players - 4 Stars. 128 players - 6 Stars. By exception, tournaments of less than $150000 receive no draw size stars, and tournaments of less than $200000 receive no additional stars for 96 or 128 player draws.

POINTS

Players are given points according to the round they lose in and the tournament's star rating. In adition players receive bonus points for defeating ranked and/or seeded players.
Players reaching the second or any round of a tournament by drawing a Bye shall receive first round points if they lose in the first round they play in.
Players losing in the first round of any tournament receive 1 point no matter the draw size. Qualifiers receive 1 additional point to their total for the tournament. They also receive 1 bonus point for each win against a Top 150 players in the qualification rounds for a maximum of 3 bonus points.
The table below shows the point distribution for tournament star rating, tournament main draw size and round. The colors in this table are the same used inside the Ranking tables from this site on ranking weeks where this system applies.

CATEGORY	MD	W	F	SF	QF	R16	R32	R64	R128	Q
30*	128	310	233	155	78	39	20	10	1	1
29*	128	300	225	150	75	38	19	10	1	1
28*	128	290	218	145	73	37	19	10	1	1
27*	128	280	210	140	70	35	18	9	1	1
26*	128	270	203	135	68	34	17	9	1	1
25*	128	260	195	130	65	33	17	9	1	1
24*	128	250	188	125	63	32	16	8	1	1
23*	128	240	180	120	60	30	15	8	1	1
22*	128	230	173	115	58	29	15	8	1	1
21*	128	220	165	110	55	28	14	7	1	1
20*	128	210	158	105	53	27	14	7	1	1
19*	128	200	150	100	50	25	13	7	1	1
18*	128	190	143	95	48	24	12	6	1	1
17*	128	180	135	90	45	23	12	6	1	1
16*	128	170	128	85	43	22	11	6	1	1
15*	64	160	120	80	40	20	10	1(5)	-(1)	1
14*	64	150	113	75	38	19	10	1(5)	-(1)	1
13*	64	140	105	70	35	18	9	1(5)	-(1)	1
12*	64	130	98	65	33	17	9	1(5)	-(1)	1
11*	64	120	90	60	30	15	8	1(4)	-(1)	1
10*	64	110	83	55	28	14	7	1(4)	-(1)	1
9*	32	100	75	50	25	13	1(7)	-(1)		1
8*	32	90	68	45	23	12	1(6)	-(1)		1
7*	32	80	60	40	20	10	1(5)	-(1)		1
6*	32	70	53	35	18	9	1(5)	-(1)		1
5*	32	60	45	30	15	8	1(4)	-(1)		1
4*	32	50	38	25	13	7	1(4)	-(1)		1
3*	32	40	30	20	10(15)	5(10)	1(5)	-(1)		1
2*	32	30	23	15	8(11)	4(8)	1(5)	-(1)		1
1*	32	20	15	10	5(7)	3(5)	1(3)	-(1)		1

Additionally, from 31 to 40 stars, the same increment is applied, 10p for the winner, 75% for the finalist, 5p for the semi-finalist, half of SF points (ceiling rounding) for QF, half of QF points (ceiling rounding) for R16, half of R16 points to R32, half of R32 to R64 and 1p constantly for R128 (the first round).

BONUS POINTS

Players receive bonus points for defeating Top 150 ranked players. The match must have been played in order to count (withdrawals do not count). Players get 30p for defeating players ranked 1-5, 24p for 6-10, 20p for 11-15, 16p for 16-20, 12p for 21-30, 6p for 31-50, 3p for 51-75, 2p for 76-100 and 1p for 101-150.

SATELLITE POINTS

With great efforts from Sebastien Cognet, we can now have a precise outlook into how Satellite points were offered.
ATP Points were offered in accordance with the final circuit standings and in accordance with the circuit total prize money. The structure for a 25K circuit for instance mirrors the point awards of a 25K 1 STAR tournament: W - 20p, 2nd - 15p, 3-4 - 10p, 5-8 - 5p, 9-16 - 3p, 17-32 - 1p.
The above applies for every increment/decrement of 12.5K in prize money, which awards an extra 5p to the winner and has mathematical increments/decrements for the rest of the players.
After the base ATP points are awarded, players also receive bonus points for high placements in individual tournaments within a circuit. They receive 2p for a tournament win and 1p for a final, in case a tournament is not a Masters circuit ending tournament. They receive 3p for a win, 2p for the final and 1p for a rank 3-4 in the final Masters tournament of a circuit.

RANKING RULES AFTER 1984

SYSTEM SPAN: 52-WEEK ROLLING SYSTEM [Tournaments counted for each player drop out of their breakdown 52 weeks after they enter the system]

SYSTEM TYPE: STAR BASED [Tournaments have different point weights according to the number of stars a tournament held. The stars were assigned according to rules described below]

TOURNAMENTS: MINIMUM OF 12 [Players could count as many tournaments as possible, but the average was obtained from a minimum divisor of 12. Players with less than 12 tournaments obtained their average by dividing their total points to 12]

MINIMUM PRIZE MONEY: $25000

BASE RULES

Players withdrawing before the first round is played will count the tournament to their average list, and late withdrawals will count as a penalty of 0 points (and tournaments counted for average).

TIES BEFORE JULY 1985

When two or more players have the exact same average, they will be considered ranked on the same position.

TIES AFTER JULY 1985

When two or more players have the exact same average, if they have 12 or more tournaments played, players would be ahead of the ones with less than 12 tournaments, and tied players would be separated by a yet-to-be-determined criteria.

STAR ASSIGNATION

Tournaments were given stars according to the following rules:

Prize Money Between $25000-$150000: Tournaments receive one star for each increment of $25000 in prize money.

Prize Money Between $150001-$500000: Tournaments receive 6 stars plus one star for each increment of $50000 in prize money.

Prize Money Between $500001-$1025000: Tournaments receive 13 stars plus one star for each increment of $75000 in prize money.

Prize Money Over $1025000: Tournaments receive 20 stars plus one star for each increment of $100000 in prize money.

POINTS

Players are given points according to the round they lose in and the tournament's star rating. In adition players receive bonus points for defeating ranked and/or seeded players.

Players reaching the second or any round of a tournament by drawing a Bye shall receive first round points if they lose in the first round they play in.

Players losing in the first round of any tournament receive 1 point no matter the draw size. Qualifiers receive 1 additional point to their total for the tournament. They also receive 1 bonus point for each win against a Top 150 players in the qualification rounds for a maximum of 3 bonus points.

The table below shows the point distribution for tournament star rating, tournament main draw size and round. The colors in this table are the same used inside the Ranking tables from this site on ranking weeks where this system applies.

BONUS POINTS

SATELLITE POINTS

With great efforts from Sebastien Cognet, we can now have a precise outlook into how Satellite points were offered.

ATP Points were offered in accordance with the final circuit standings and in accordance with the circuit total prize money. The structure for a 25K circuit for instance mirrors the point awards of a 25K 1 STAR tournament: W - 20p, 2nd - 15p, 3-4 - 10p, 5-8 - 5p, 9-16 - 3p, 17-32 - 1p.

The above applies for every increment/decrement of 12.5K in prize money, which awards an extra 5p to the winner and has mathematical increments/decrements for the rest of the players.