Former world number one Ana Ivanovic, now ranked 40, gets proceedings under way in searing heat on day three with a comprehensive straight sets demolition of eighth seed Jie Zheng 6-3 6-0
There's not such good news over on the Grandstand court as Belarussian 10th seed Victoria Azarenka collapses while serving at 1-5 down to Gisela Dulko in the first set. Azarenka's fall draws gasps from the worried crowd
Azarenka, who also had to retire from last year's Australian Open, called for the trainer as early as the third game and she receives medical attention after collapsing at 15-30 down
Azarenka is helped off court in a wheelchair and taken to hospital. Later, she reveals she had fallen in the gym prior to her match while running and had hit her head and arm. She is diagnosed with mild concussion
Former Wimbledon finalist and 13th seed Marion Bartoli is another player in trouble as she loses to fellow Frenchwoman Virginie Razzano
British number one Andy Murray, a beaten finalist here two years ago, gets his campaign under way with a first round match against Slovakia's world number 71, Lukas Lacko
Murray deals with the heat and Lacko in equally impressive fashion as he cruises into round two with a straight sets 6-3 6-2 6-2 victory at Arthur Ashe Stadium
That sets up a second-round clash with Jamaica's Dustin Brown after he saw off the challenge of Spain's Ruben Ramirez Hidalgo 6-4 7-6 (6) 7-5
Elsewhere, there is a surprise in the men's draw as US teenager Ryan Harrison, a qualifier, dumps out Croatia's 15th seed Ivan Ljubicic 6-3 6-7 (4-7) 6-3 6-4
There is another shock when seventh seed Tomas Berdych (left), is beaten 7-6 (7-3) 6-4 6-4 by France's world number 35 Michael Llodra. Berdych could have been a potential quarter-final opponent for Britain's Murray
British number one Elena Baltacha sees her US Open campaign end in the second round with a straight-sets defeat by Petra Kvitova on Court Six
Women's third seed Venus Williams is pushed hard by Canadian qualifier Rebecca Marino, the two-time champion eventually earning a third-round berth courtesy of a well-contested 7-6 (7-3) 6-3 victory
The night session kicks off with Kim Clijsters against Sally Peers, and the defending champion does not hang around as she wins in under an hour
Rap superstar Kanye West is among the crowd on Arthur Ashe Stadium for the final match of the day between Andy Roddick and Janko Tipsarevic
Roddick comes out all guns blazing as he continues his bid to reclaim the title he won in 2003 and the American takes the first set
But Roddick is pegged back by the brilliant Tipsarevic and at the end of the third set the American turns his anger on a line judge
Tipsarevic stays cool to record a 3-6 7-5 6-3 7-6 (7-4) victory over the home favourite and former champion
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