Grand Slam are always the most exciting venues for tennis glamour and the US Open is the unofficial fashion queen of all the four majors, so let's see what the best brands put on their brightest WTA stars.

Let's start this fashion overview with maybe not the biggest fashion star, but definitely the player who marked this US Open – Kim Clijsters, whose inspiring career has come to a close at her favorite tournament where she had lifted the trophy three times. To honor the Belgian's last event, her clothing sponsor Fila produced a special collection with a symbolic star pattern.

Ana Ivanovic (who reached her first Grand Slam quarterfinal since her title win at Roland Garros 2008), Angelique Kerber (last year's semifinalist) and Laura Robson (besides Clijsters, the biggest story of the tournament) were all sporting Adidas Adizero. The bright yellow Adidas outfits may have ruled the US Open courts, and the three players mentioned here all played the fourth round, but the next brand we'll cover is clothing all the four semifinalists!

Of course, it's Nike! Champion Serena Williams and Maria Sharapova traditionally have both day and night dresses. Serena wore navy and pink with lime details, while Sharapova went for more subtle tones – liquid pink and solid dark without many loud contrasts.

PREVIOUS US OPEN FASHION OVERVIEWS

2011 - A look at the beautiful colors at Flushing Meadows
2010 - Fashion hits and misses of tennis in New York

Victoria Azarenka and Sara Errani prefer separates. The world No.1 is popping in a yellow and black combination, while the Italian, sharing the look with Julia Goerges, wore a pleated navy skirt with pink and yellow stripes and a tank. Read more »

In her first Grand Slam quarterfinal since Roland Garros 2008, Ana Ivanovic was unlucky to bump into Serena Williams and suffer the same fate as most Serena's recent opponents – a short stay on the court. Going up 3-0 in the first set against Ivanovic, Serena had won 23 straight games! The match finished in just 58 minutes and Serena won stunning 26 of 29 points on her first serve, while hitting 12 aces to Ivanovic's zero. Final score: 6-1 6-3.

Ivanovic has to find satisfaction in improving her game and reaching her first US Open quarterfinal, accepting the fact that Serena has been pretty much unbeatable lately. This summer she won Wimbledon and the Olympic gold in both singles and doubles, while at the US Open she's been a champion three times and has made at least the semifinals the last four times she played the tournament.

Serena's semifinal opponent will be Sara Errani, the first Italian US Open semifinalist in the Open Era, who will become No.1 in doubles after the tournament. To advance to the final four, Errani beat her best friend and regular doubles partner Roberta Vinci 6-2 6-4. The other semifinal will feature Victoria Azarenka and Maria Sharapova. (photo: Ralf Reinecke)

Eighteen Grand Slams after her last Grand Slam quarterfinal in 2008 when she went all the way to the title at Roland Garros, Ana Ivanovic is finally in another Grand Slam quarterfinal and actually her first ever at the US Open.

To advance to the last eight Ivanovic even produced one bagel against Tsvetana Pironkova, 6-0 6-4. Pironkova, the 2010 Wimbledon semifinalist, held serve just once in the match and Ivanovic converted all seven of her seven break points. Even though troubled by a neck injury, Pironkova made a fightback in the second set, including breaking Ivanovic when she was serving for the match, but the Serb broke back immediately to ensure progress.

Ivanovic's quarterfinal opponent is Serena Williams and Ivanovic's knees must be shaky. Why? Serena's US Open win-loss record is 62-9, her 2012 record is 50-4, she won her previous four matches with scores 6-1 6-1, 6-2 6-4, 6-4 6-0 and 6-0 6-0 in the fourth round against Andrea Hlavackova, while her career record against Ivanovic is 3-0 (all straight-set wins) and two of those victories came at the US Open. I had my hopes high for Ivanovic to finally come back to the quarterfinal stage of a Grand Slam, but this obstacle, I'm afraid, she'll not overcome.

Other quarterfinal pairs: Victoria Azarenka (1) vs. Samantha Stosur (7), Maria Sharapova (3) vs. Marion Bartoli (11) and Sara Errani (10) vs. the winner of the match between Roberta Vinci (20) and Agnieszka Radwanska (2).(photo: © Neal Trousdale)

For the second year in a row at the US Open, Ana Ivanovic defeated Sloane Stephens in the third round. The question now is, can the Serb overcome the obstacle of the Grand Slam fourth round that has troubled her since her 2008 French Open trophy?

Sixty-two spots higher in the WTA rankings than in their last year's US Open match, the 19-year-old Stephens, the youngest Top 50 member, hit 10 double faults against Ivanovic, but was greatly helped by Ivanovic's 56 unforced errors. In the deciding set, however, Ivanovic reduced the number of errors, from 21 and 22 in the first to sets, to 13, and her winners-UE differential improved from -8 in the first and second set, to -3 in the third, while Stephens converted just one out of seven break points in that third set and hit six double faults.

Ivanovic's opponent in the fourth round will be Tsvetana Pironkova, and although they are tied at 1-1 in head-to-head, their last meeting was before the 2008 French Open. Pironkova is best known for her 2010 Wimbledon semifinal, when she became the first Bulgarian, male or female, to play a Grand Slam semifinal.

The Bulgarian, who turned pro in 2002, is a hilarious character. Do you know that only last year she realized that ranking points are awarded at all WTA tournaments and not just Grand Slams? 

I've been a pro for a while, but I must have missed that memo. I go to some of those tournaments, of course, but–unless I get the urge to upset one of the big stars–I like to leave early. The practice, the locker room chaos, the crowds–it can be so dreary.

Plus, she actually loves the rain at Wimbledon, because she loves water and her father was a canoe champion and mother a swimming champion:

The problem I have with tennis courts, is that they're dry. That's why I like Wimbledon; there's usually a lot of rain, and I can splash around like I do at home.

So, who's your pick, Ivanovic or Pironkova? I believe in Ivanovic! (photos: © Neal Trousdale)

Not a bad day for Serbian tennis. Even though young Serbian prospect Bojana Jovanovski fell in two tiebreaks in a courageous fight against Dominika Cibulkova in the second round of the US Open, Ana Ivanovic and Jelena Jankovic are progressing little by little.

After beating Elina Svitolina 6-3 6-2 in the first round, the 12th-seeded Ivanovic was dictating her second-round match against Sofia Arvidsson, comfortably taking out the Swede 6-2 6-2. Ivanovic took the first set in 29 minutes, fending off all six break points that Arvidsson earned. Clearly, the match depended on Ivanovic and her ability to avoid unforced errors in her attacking game. In the second set Arvidsson did break Ivanovic's serve two times, but she couldn't neutralize the Serb's 4-0 initial lead. In the end, Ivanovic hit 39 winners to Arvidsson's just 7, while in the unforced errors department Ivanovic's outcome was 23 to Arvidsson's 9. Read more »