Serena Williams (USA)  vs.
Roberta Vinci (ITA)  vs
Simona Halep (ROU)  Flavia Pennetta (ITA). This is a very curious match up between two Italian players for a semifinal berth at the US Open, the second consecutive year where this has happened. Last year the two compatriots were World #4 Sara Errani and her doubles partner Roberta Vinci. This year, however the two Italians are Vinci and the "grande dame"of Italian tennis Flavia Pennetta, who has always played some of her best tennis in New York. It is interesting to note that the Italian player who is playing in her second consecutive US Open quarterfinal is the unheralded Vinci, not the World #4 Errani. However it will most likely be Pennetta who will win her 4th U.S. Open quarterfinal and reach her very first career major semifinal. PREDICTION: Pennetta.
Victoria Azarenka (BLR)  or Ana Ivanovic (SRB)  vs. Daniela Hantuchova (SVK). Because of the torrential rain that fell on Monday, the fourth round match between Victoria Azarenka and Ana Ivanovic was eventually cancelled. This means that the participants in this final quarterfinal are not known at this time. However, Azarenka has a very good head to head record against Ivanovic so I believe that she will win this match and reach her second career quarterfinal in New York. Against her potential quarterfinal opponent Hantuchova she only has a 2-2 record, but I still think that Azarenka will find a way to reach her second career consecutive final. PREDICTION: Azarenka.