Serena Williams fails to convert a set point before dropping the tie-break in her match against Justine Henin

Henin is in top form as she completes a 7-6 (7-3) 6-1 win that takes her into the last four

It is the third consecutive Grand Slam in which Henin beats Williams in the quarter-finals

Ernests Gulbis is one of several surprise players in the last 16 and he faces veteran Carlos Moya on Arthur Ashe Stadium

Moya has been enjoying a good run of form lately and carries that into this match, taking a two-set lead

Moya celebrates his four-set victory as he reaches the last eight of the US Open for the first time since 1998

Juan Ignacio Chela feels the heat on Louis Armstrong, where he is taken to a fifth set by Stanislas Wawrinka

No reprieve after almost four hours on court for Chela, the victor has signing duties to perform at Flushing Meadows

Juan Monaco returns the ball through his legs in an effort to bamboozle Novak Djokovic - he still loses the first two sets

Djokovic looks in control until he misses a match point on his way to losing the third set tie-break

Djokovic recovers his poise to break twice in the fourth set as he wraps up the win

Liezel Huber and Jamie Murray go down in a third set tie-break to Leander Paes and Meghann Shaughnessy in the semi-finals of the mixed doubles

"Taste aside, it's within the attire standards," said tournament referee Brian Earley of Bethanie Mattek's attire