As always after a Grand Slam, discussions are ongoing to determine the best matches of the tournament. I thought that a look at the data provided by the AO could help bringing some insights on this.
Therefore, I have compiled the data from the official website concerning the winners and the unforced errors, which I could use in order to calculate the forced errors.
I did it for all the matches from the semifinals, quaterfinals, round of 16 and most matches played by the Top10 players and those who reached the last 16, and I added some matches that appeared of high quality (Wickmayer/Cepelova for example).
Statistically, a match will be of high quality if the winners and forced errors greatly exceed the UE. So I calculated the difference (shown in
red). And to allow a comparison between matches of different length, I have divided the aforementioned difference (in red) by the number of points played by each players. The resulting ratio indicates the quality showed by each player. The higher the better. Since a quality match would show a good display by both players, I summed the ratio obtained for each player. The best results would normally identified the best matches. It goes without saying that an outstanding performance from a player tends to magnify the global ratio.
According to my experience, when the number showed in red is negative, the player was awful. From 10 to 20 we usually talk about an average or a good performance. From 30 the player normally played some very good to great tennis and over 40 it was just an amazing display of skills. Of course, those stats can't replace the real feeling given while watching a match and they're not taking into account the quality of the rallies, net play etc.
Without further preamble, here are the best matches, from a statistical perspective (W = winners, FE = forced errors, UE = unforced errors).
The best matches:
1- Serena/Kirilenko (4th round) Global Ratio of 0.80
Serena (22W + 17 FE) - 6UE =
33. Ratio 0.61
Kirilenko (7W + 13 FE) - 15UE =
5. Ratio 0.19
Obviously, that match wasn't that good, but Serena's epic performance single-handedly bring it to the top

(and Kirilenko wasn't especially bad either, she was simply outclassed in every aspect).
2- Kirilenko/Peng (2nd round) Global Ratio of 0.71
Kirilenko (25W + 23 FE) - 16UE =
32. Ratio 0.43
Peng (25W + 19 FE) - 27UE =
5. Ratio 0.28
3- Na Li/Goerges (4th round) Global Ratio of 0.68
Na Li (16W + 30 FE) - 16UE =
30. Ratio 0.44
Goerges (9W + 25 FE) - 22UE =
12. Ratio 0.24
4- Wozniacki/Kuznetsova (4th round) Global Ratio of 0.68
Wozniacki (23W + 28 FE) - 22UE =
29. Ratio 0.32
Kuznetsova (52W + 25 FE) - 41UE =
36. Ratio 0.36
5- Radwanska/Ivanovic (4th round) Global Ratio of 0.66
Radwanska (14W + 20 FE) - 4UE =
30. Ratio 0.44
Ivanovic (35W + 10 FE) - 34UE =
11. Ratio 0.22
6- Kuznetsova/Hsieh Global Ratio of 0.60
Kuznetsova (23W + 20 FE) - 15UE =
28. Ratio 0.48
Hsieh (9W + 10 FE) - 15UE =
4. Ratio 0.12
7- Kvitova/Robson (2nd round) Global Ratio of 0.58
Kvitova (42W + 48 FE) - 51UE =
39. Ratio 0,30
Robson (25W + 52 FE) - 41UE =
36. Ratio 0,28
8- Kirilenko/Wickmayer (3rd round) Global Ratio of 0.58
Kirilenko (21W + 28 FE) - 22UE =
27. Ratio 0.35
Wickmayer(28W + 17 FE) - 29UE =
16. Ratio 0.23
9- Makarova/Bartoli (3rd round) Global Ratio of 0.57
Makarova (51W + 19 FE) - 32UE =
38. Ratio 0.34
Bartoli(27W + 38 FE) - 43UE =
22. Ratio 0.23
10- Makarova/Kerber(4th round) Global Ratio of 0.52
Makarova (32W + 22 FE) - 29UE =
25. Ratio 0.33
Kerber(23W + 11 FE) - 22UE =
12. Ratio 0.19
The good matches:
Radwanska/Watson Global Ratio of 0.49
Na Li/Sharapova Global Ratio of 0.46
Wickmayer/Cepelova Global Ratio of 0.45
Kvitova/Schiavone Global Ratio of 0.45
Vesnina/Vinci Global Ratio of 0.42
Azarenka/Hampton Global Ratio of 0.39
Wozniacki/Lisicki Global Ratio of 0.38
Serena/Morita Global Ratio of 0.38 (because of Serena's performance)
Sharapova/Flipkens Global Ratio of 0.36 (because of Sharapova's performance)
Azarenka/Kuznetsova Global Ratio of 0.32
The worst matches:
Those are either a total domination from a player or a pure shitfest.
1- Sharapova/Doi (2nd round) Global Ratio of -0.54
Sharapova (16W + 12 FE) - 9UE =
19. Ratio 0.40
Doi (1W + 5 FE) - 20UE =
-14. Ratio -0.93
2- Wozniacki/Tsurenko (3th round) Global Ratio of -0.35
Wozniacki (5W + 12 FE) - 17UE =
0. Ratio 0.00
Doi (19W + 12 FE) - 48UE =
-17. Ratio -0.35
3- Radwanska/Bobusic (First round) Global Ratio of -0.28
Radwanska (10W + 16 FE) - 16UE =
10. Ratio 0.15
Bobusic (17W + 7 FE) - 41UE =
-17. Ratio -0.43
4- Jovanovski/Date-Krumm (3th round) Global Ratio of -0.25
Radwanska (29W + 22 FE) - 52UE =
-1. Ratio -0.01
Bobusic (9W + 10 FE) - 36UE =
-17. Ratio -0.24
5- Serena/Gallovits (3th round) Global Ratio of -0.24
Serena (18W + 15 FE) - 11UE =
22. Ratio 0.42
Gallovits (1W + 6 FE) - 19UE =
-12. Ratio -0.66