After a slow day yesterday, we're back to a really strong lineup of matches today.

Rafael Nadal debuts at the Open at Arthur Ashe, right after Ana Ivanovic and Venus Williams finish up against their unknown opponents.

Streaky Marat Safin plays at 11 this morning on Louis Armstrong, followed by Justine Henin. Next door, at the very loud Grandstand there will be a delightful lineup full of Americans: Meghann Shaughnessy, Robby Ginepri, Mardy Fish and upstart Ahsha Rolle.

On Court 11, Elena Dementieva plays the second match, followed by former French Open Champion Carlos Moya. Over at Court 13 there are back-to-back matches featuring Spaniard Tommy Robredo and the lovable Marion Bartoli.

Match of the Day: giant American John Isner takes on South African Rik De Voest (10 inches shorter!) in the battle of 100-something seeds at night time in Louis Armstrong. The winner gets a crack at Roger Federer. Expect electricity.

Each morning here at the Observer's U.S. Open blog we're going to tell you what to look out for in the day's action. Today's tip: arrive early!

The heavy-hitters -- Jelena Jankovic, Justine Henin, Roger Federer -- will steal the spotlight at Arthur Ashe today. But you know how these first-round matches go: some of them are over in 40 minutes. If you have a pass that lets you into Arthur Ashe, don't be late.  read more »