Andy Murray beats Matthias Bachinger 6-3 6-3 6-4 to make the third round
Eugenie Bouchard v Sorana Cirstea follows
Top seeds Serena Williams and Novak Djokovic through in straight sets
Eighth seed Ana Ivanovic knocked out by Karolina Pliskova
BBC Radio 5 live
Andy Murray is looking loose and lithe as he bashes down a few practice serve. We are about to get under way, in front of a less than full Arthur Ashe Stadium, and you can listen live on BBC Radio 5 live.
Matthias Bachinger: "I have to play my best tennis, but my first goal is to enjoy the match and the atmosphere. I'm not the favourite, but in tennis there is always a chance."
Image source, Getty ImagesOver the other side of the net from Murray, barring his way to the third round, is Matthias Bachinger.
The German is a month older than Murray, but a whole lot less experienced.
His straight-sets win over Radek Stepanek on Monday was his first in a Grand Slam. He was unsuccessful in qualifying for the Australian Open, French Open and Wimbledon this year.
The highlight of his season has been reaching the quarter-finals of Challenger-level events in Guangzhou, Cortina and Meerbusch.
All of which I would struggle to pin on a world map.
Image source, APThe good news for Andy Murray is that, as the first match of the evening session at Flushing Meadows, he has been spared from the hottest part of the day.
The mercury is hovering somewhere around 25 degrees in the Big Apple and will only be heading south from here on in.
Image source, APIn his first-round match against Robin Haase however, Murray had to overcome not only the Dutch world number 70, but his own muscles as they seized up around him.
"I started cramping at the beginning of the third set, at the front of my quad and then in my forearm," said Murray.
The Scot took to standing at changeovers - fearful of the lactic acid collecting elsewhere.
Image source, Getty ImagesAndy Murray is not the first Brit to be caught out in sweltering foreign climes.
Skin scorched lobster-red, brain cells sucked dry by dehydrating lagers - the last few months will have seen a few sons of Albion come to grief under a foreign sun.
But Murray is made of stronger stuff.
Sent to Spain as a teenager, exiled in a brutal Miami training camp for much of the British winter, he is the victorious veteran of a sauna of a Wimbledon final and has reached three Australian Open finals in stifling Melbourne heat.