Mikhail Youzhny

What to Watch at US Open: Will Djokovic play full semifinal?

Novak Djokovic's opponent in the U.S. Open semifinals, Gael Monfils, might just want to hole up somewhere safe until it's time to walk out on the court in Arthur Ashe Stadium on Friday afternoon.

Don't practice too strenuously.

Let someone else carry the racket bag.

Be extra careful crossing busy streets in Manhattan.

It's been hazardous to one's health to get drawn to face Djokovic during this tournament: The defending champion and No. 1 seed has enjoyed an unprecedentedly easy path to the final four at Flushing Meadows, needing to complete only two of five matches because of injuries to three foes.

"This Grand Slam is very unique for me,"...