Although she still has to win two more matches, Serena Williams is considered the overwhelming favorite to win the 2012 U.S. Open.
Based on the numbers, you can understand why.
Williams has lost a total of 16 games and is the only one of the four semifinalists who has yet to drop a set. She's also a combined 21-3 against the three other players -- Sara Errani, Victoria Azarenka, Maria Sharapova -- left in the semifinals.
However, one year ago, Serena rolled through the semifinals without dropping a set, losing a total of 29 games. It was almost a foregone conclusion that she would beat Samantha Stosur and win a fourth U.S. Open title.
Stosur won the final convincingly 6-2, 6-3.
So what exactly did Stosur do in last year's final that might work as a blueprint for either Errani, Azarenka or Sharapova?