I'm exhausted after posting the men's draw so I'm going to keep this short.
Wozniacki stays as the No.1 seed for the US Open. Since becoming No.1 I think the main question on everyone's mind is when will she win a slam, sadly I don't think this will be the one. She had her chances a few slams ago but now a new breed of opponent has developed, she's no longer a favourite to win any slam. Coupled with her poor results pre US Open I think Wozniacki will be happy to even make the SFs.
I'd expect Wozniacki to be safe for the first three rounds but then there's Hantuchova and Kuznetsova on the horizon. Both are not in great form but both are capable of beating Wozniacki. It will depend what type of form Wozniacki is in herself.
Even more danger lurks after the 4th Round with Petkovic and Na Li being the main contenders for a SF spot. Petkovic possibly is the favourite here as Na Li hasn't been as strong since winning Roland Garros, the French Open must be cursed. It all depends on Wozniacki's own performance because in a way she has been given a good draw.
Azarenka is being considered the unlucky Top 8 player because she has been drawn against Serena Williams. I am so disappointed for her because I think she's ready to win a slam but facing Serena this early could be too much to handle. If she makes it through Peer and Ivanovic wil not be dangers. In fact if Azarenka manages to survive Serena she has a relatively OK draw with Jankovic, Pavlyuchenkova and Schiavone being her main threats. Jankovic saw a resurgence in Cincinnati but is she ready to become a top player again? Her Grand Slam record has been rather average since 2008. Schiavone is yet again seeing a slump after Roland Garros, she might as well hibernate for the year until Roland Garros comes around.
I remember when Wozniacki, Azarenka and Radwanska were named as the three rising stars of tennis. Wozniacki and Azarenka have both taken their places amongst the elite but it has only been the past month or so that Radwanska has finally responded. She has Petra Kvitova in her draw as well as dangers such as Lucie Safarova and Yanina Wickmayer so there's a lot to contend with. Unluckily enough she'll face her sister in the first round, Urzula Radwanska.
On the other side is Maria Sharapova who has Heather Watson as her Round 1 opponent. I think Sharapova must be second favourite to win the title. In her way are Flavia Pennetta, Julia Goerges and Shuai Peng. All have the potential to do damage but aren't really title contenders.
Finally there's Zvonareva's section which would be rather boring if it weren't for Venus Williams and Sabine Lisicki's 2nd Round match off. Besides Vera there is Bartoli, Stosur and Cibulkova looking to make the SFs. It's quite difficult to predict who will make it out of these six names because they're all rather unpredictable.
Sorry for the rather rushed analysis, I'm just really tired after typing up the men's draw.