OK, similar to what I tried with NFL stats, I've messed around with tennis, my favorite spectator sport (at least the Grand Slams).

Please credit the author for any reuse; errata or questions are appreciated

The typical caveats apply, about comparisons between different decades, eras, etc.  Stats only tell part of the story, which is why I also include my personal rankings aside from the numerical results.

The first rankings stem from analysis of Grand Slam final results, combined with overall win % on tour.  Detailed explanation follows later.

Purely from the numerics, we see the following rankings for the players treated (see notes later)

                    Women                                   rating                       GST          Career%        GSF%     GSFW          GSFL          CareerW          CareerL

Notes:  many players not analyzed (pre-'78):  Wills-Moody, Lenglen, Sukova, Maleeva, Capriati, Davenport etc.  Novotna,Vicario were.

           % differences are insignificant at a certain band obviously - 1.594 vs 1.592 for example

          Seles' had the devastating knifing incident at the peak of her career (8-1 in GS finals just prior)

          minimum total GS titles for inclusion is 10, noting that doubles wins are given half-credit

          Tennis Hall of Fame are shown in purple shading, active players in italics

          any player's rating can easily be computed when the stats are available

          the column immed to right of rating is how many of the 4 Grand Slams the player won titles at (S/D/M)

          GST=Grand Slam titles  Career%=career win %   GSFW=Grand Slam final wins   rating is my custom formula treating total GS titles, Grand Slam

               final win%, and career win%, with respective weightings of (0.0075,1.0,1.0).  For example, Margaret Court's rating is obtained via:

               47*0.0075+ 0.917 + 0.702 =1.97

          I have left the table sortable so readers can sort on preferred stat;  stats are mostly from Wikipedia

          The Williams sisters are surefire bets for inclusion to the Hall of Fame (Serena is already top 5 using the above)

          Worthy of note are career Grand Slam (singles) holders:  Court, Billie Jean King, Evert, Navratilova, Graf, Serena      

               career Grand Slam (doubles) holders:  Court, Navratilova, Shriver, Serena, Venus

Personal list (tentative, in order, of those I saw play):  Graf,Navratilova,Seles,Serena,Hingis,Henin.  Graf was the best female player I've seen.

                                   Men                         rating                     GST          Career%        GSF%     GSFW          GSFL          CareerW          CareerL 

Personal list (tentative, in order, of those I saw play):  Federer,Borg,Sampras,McEnroe,Becker,Lendl,Mecir.  Federer is the best male player I've seen.

Worthy of note are career Grand Slam (singles) holders:  Agassi, Federer     Grand Slam (doubles) holders:  Woodbridge, Woodforde

list did not treat pre Open era incl Laver, NewCombe, Emerson, Tilden  but did treat Lendl, Courier, Chang, Krickstein, Rafter, Safin, Goran, Kuerten, Bruguera,

Moya, Muster, Noah, Vilas, Nadal

The statistics do not seem to credit a player like Lendl as much as he deserves; Borg&McEnroe's ratings are impressive given how infrequently they played the Australian Open