The Best Day at the Open

rsz 76382069 The Best Day at the OpenDon't look further than Day 7. This will be the best day at the 2007 U.S. Open.

The Williams sisters both have fantastically difficult challenges on Ashe today. We’ll preview both matches this morning and find out exactly what their opponents need to do to win.

Meanwhile, Justine Henin gets Dinara Safina in an extremely intriguing night match on Ashe (as we’ve mentioned, playing at night is not Henin’s favorite). Novak Djokovic will follow by playing the young Argentine prospect Juan Martin Del Potro.