Things just got serious at the 2012 U.S. Open. Bulgaria's Victoria Azarenka (1) will face 2011 defending champion Samantha Stosur (7) in the first match at Arthur Ashe Stadium and the first match of the Women's Singles quarterfinals. 

Both women have played excellent tennis throughout the tournament, but this match should be a treat as they will face each other. 

In her road to the quarterfinals, Azarenka has defeated Alexandra Panova of Russia 6-0, 6-1. She then went through Belgium's Kirsten Flipkens 6-2, 6-2. Jie Zheng of China followed as Azarenka easily defeated her 6-0, 6-1. Anna Tatishvili of Georgia was next 6-2, 6-2. 

The Australian, Stosur has bounced back from disappointing appearances at the Australian Open and most recently a second round exit from Wimbledon. 

So far in 2012, she has surpassed Georgia's Petra Martic 6-1, 6-1 and Edina Gallovits-Hall of Romania 6-3, 6-0. She did not look so great in the match against American Varvara Lepchenko as she struggled to get past the first set 7(7)-6(5), 6-2. She then defeated Great Britain's Laura Robson 6-4, 6-4. 

Following this match, Maria Sharapova (3) will meet Mario Bartoli in the second game of the Women's Singles quarterfinals.

If you have not been following the U.S. Open, now will be a great time to tune in. 

Time
The action begins at 11 a.m. ET from Queens, New York. 

TV Coverage
You can watch the matches on ESPN2.