From: clc5q@uvacs.cs.Virginia.EDU (Clark L. Coleman)
Newsgroups: rec.sport.tennis
Subject: IBM/ATP Computer Ranking Method
Date: 26 Aug 92 21:48:12 GMT
Organization: University of Virginia Computer Science Department
Originator: clc5q@hemlock.cs.Virginia.EDU

Here is the complete information about the computer ranking points on the
IBM/ATP Tour.  Players are ranked on the basis of their best 14 results in
the previous 52 weeks. Prize money listed is on-site (not including hotel
rooms, etc., called "hospitality") and is in U.S. Dollars.


                  Total            Computer Points: Round of Loss
Category       Prize Money     W    F    S    Q    16   32   64   128
--------       -----------    ---  ---  ---  ---  ---- ---- ---- -----
Grand Slams     4,000,000     520  390  260  130   65   33   17    1
                3,500,000     500  375  250  125   63   32   16    1
                3,000,000     480  360  240  120   60   30   15    1
                2,500,000     460  345  230  115   58   29   15    1
                2,000,000     440  330  220  110   55   28   14    1

Championship    1,875,000     300  225  150   75   38   19   10    1
  Series        1,750,000     290  218  145   73   37   19   10    1
                1,625,000     280  210  140   70   35   18    9    1
                1,500,000     270  203  135   68   34   17    9    1
                1,375,000     260  195  130   65   33   17    1    1
                1,250,000     250  188  125   63   32   16    1
                1,125,000     240  180  120   60   30   15    1
                1,000,000     230  173  115   58   29   15    1
                  875,000     220  165  110   55   28   14    1
                  750,000     210  158  105   53   27   14    1
                  625,000     200  150  100   50   25   13    1

World             675,000     170  128   85   43   22   11    1
  Series          600,000     160  120   80   40   20   10    1
                  525,000     150  113   75   38   19   10    1
                  450,000     140  105   70   35   18    9    1
                  375,000     130   98   65   33   17    9    1
                  300,000     120   90   60   30   15    8    1
                  225,000     110   83   55   28   14    7    1
                  150,000     100   75   50   25   13    1

Challengers*      100,000+H    80   60   40   20   10    1
                  100,000      70   53   35   18    9    1
                   75,000      60   45   30   15    8    1
                   50,000      50   38   25   13    7    1
                   25,000      40   30   20   10    5    1

* Any Challenger providing hospitality will receive the points of the next
  highest prize money level. (Note: 100,000 + H points are shown).

First Round Losers
------------------
First round losers always receive 1 point. Any player who reached the second
round by drawing a bye and then loses will receive second round prize money
but only 1 point.


Bonus Points
------------

Main Draw Bonus Points
----------------------

The following points are awarded for defeating a player ranked #1 through 200
or a doubles team ranked 2 through 400. The match must actually be played,
not a walk-over.

 1. Singles
    -------
    Ranking        Bonus Points
    -------        ------------
       1               50     
      2-5              45
      6-10             36
     11-20             24
     21-30             18
     31-50             12
     51-75              6
     75-100             3
    101-150             2
    151-200             1

2. Doubles
   -------
    Ranking        Bonus Points
    -------        ------------
      2-3              50     
      4-10             45
     11-20             36
     21-40             24
     41-60             18
     61-100            12
    101-150             6
    151-200             3
    201-300             2
    301-400             1

As this does not make sense as written, I assume it means that you compute
the sum of the doubles rankings of the opposing team members (which could
only be 2 if they were tied for #1) and thus there is no #1 listed, and all
the rankings are twice as much as the corresponding singles rankings.

Qualifying Points
-----------------
 A player or team gaining entry to an event through a qualifying
competition shall receive one half the points awarded to a second
round loser in that event as bonus points, in addition to whatever
points they actually earn in the event. Lucky losers do not receive
these bonus points. There are no bonus points awarded in the qualifying
event itself, regardless of opponents' rankings.


Ranking Penalty: Withdrawals After 12 Noon Eastern Time USA
-----------------------------------------------------------
If a player withdraws from an event after 12 Noon Eastern Time USA
on the Friday before the start of the event, he will be penalized in
the rankings by one event per 12 month perido, e.g. he will be ranked
by his best 13 events instead of his best 14 events after one such
infraction, by his best 12 events after 2 such infractions, etc. The
penalty shall remain in force for 52 weeks after the time of the infraction.
This penalty shall be waived if, within the first 3 days of the main
draw, the player is examined on-site by the tournament doctor and deemed
incapable of competing at a professional level.
-- 
-----------------------------------------------------------------------------
"It is seldom that any liberty is lost all at once." David Hume
|||  clc5q@virginia.edu (Clark L. Coleman)
Newsgroups: rec.sport.tennis