Andy Murray's next opponent is Germany's Matthias Bachinger, who surprisingly beat Radek Stepanek 6-3 6-2 6-2. The 6ft 2in right-hander is playing just his second US Open but didn't let inexperience hinder him against the veteran Czech.

Murray and Bachinger will take to the court on Wednesday. It's time for us to end this live text commentary, let the world's best tennis players play in peace. Thanks, as always, for your contributions. Until tomorrow...

One Briton departs and another appears. Johanna Konta is about to start her first-round match with Israel's Shahar Peer on Court 11.

The pair had to wait a while as Julien Benneteau's tie with compatriot Benoit Paire turned into a five-setter. The unseeded Paire was a 7-6 (7-4) 5-7 6-4 4-6 6-4 winner.

On Arthur Ashe, Venus Williams has failed to serve out for the match, which gives Kimiko Date-Kruum hope at 5-3 in the third.

The serve was a problem for Murray as cramp set in during the third set. He won 60% of points on his first serve and 51% on his second serve - averaging 100mph and 82mph on his first and second serve respectively.

Russell Fuller
BBC tennis correspondent at Flushing Meadows

"I can't really remember anybody else being affected by injury like that. What is it down to? There's no question mark about his fitness, it was hugely surprising. It leads you to believe tension played a part but we will hopefully get some answers from Murray but it's even harder to be optimistic about his chances after that first round match."

Nick Bollettieri
American tennis coach on BBC Radio 5 live sports extra

"We have to compliment Andy Murray, he didn't moan and groan, he didn't make excuses but let's also say the mind of Haase was disturbed. He thought he had the match but he fell apart mentally."

Murray and Haase embrace at the net, with the Scot apologising to his opponent about his injury.

"My quads were cramping and I started to get it in my forearms," Murray tells Sky Sports.

"I didn't know what to do, whether to conserve energy or try to finish it in three sets. I just tried to play without using my legs much. These Slams are physically challenging, I need to work out why that happened today because it shouldn't happen after an hour and 45 minutes, even though it was hot."

David Law
BBC Radio 5 live sports extra commentator

"I think a lot of tennis players would have said it was an injury and got a trainer on but Andy Murray is a fair player and he knows cramp is not an injury."

"Make my day," says Haase as he superbly returns to draw level at 30-30, twirling his pistol in his hand, chewing on a toothpick. Murray thought he had done the hard part, breaking Haase in the previous game, but he must now prepare for another showdown. Murray saves two break points - Haase netting a thunderous Murray forehand for deuce.

A third break point to Haase... Murray stretching the left shoulder before launching the second serve.... and it's a clean winner from Murray! Deuce! And minutes after we were preparing to talk about the Scot's demise, Murray has match point and victory is his when a Haase forehand dribbles towards the net.

Haase performing like a man who thought he had killed off his enemy with one debilitating punch after another, only to see him crawl back while his back was turned. Murray wiping the spittle away with the back of his hand and begging for more. The Scot collects two break points, wastes one but grabs the second with a wonderful return. "Is that all you've got, punk," Murray says. (He doesn't, but you get my drift).

Gigi Salmon
BBC Radio 5 live sports extra commentator

"This is a ridiculously topsy-turvey set."

Max Beech:, external Win or lose this match - Murray needs more matches and more time to recover. This is not Mauresmo.

Nick Bollettieri
American tennis coach on BBC Radio 5 live sports extra

"The mind of Haase is bewildered. He doesn't know what to make of this."

An 83mph second serve from Murray is good enough to outwit Haase for the opening point. The Scot dragging Haase from tramline to tramline and, without having to move from the middle of the baseline, the Brit passes teh Dutchman with a canny forehand. An improbably 40-0 lead for the Scot, though Haase is back in contention at 40-30 - a 75mph second serve perhaps a touch optimistic from Murray. He comes through the test though and Murray, the great thinker, is back from the brink.

An ace takes Haase to 30-30, but Murray digs deep into his reserves of energy. The fuel gauge might be low but the Scotsman can still produce a dazzling winner into the corner. What? A double faults? Haase double fault and Murray's alive! He's alive!

Image source, PA

Alex Hunter:, external Feel very sorry for Andy here - his anticipation and movement are such big weapons and he's hobbling at 50% and can barely serve

These two opponents performing like out-of-condition old-time heavyweights. The pace has been slowed down, they're slugging it out with one hopeful hit after another. It's painful to watch. Everything happening as if it were in slow-motion. Pride is preventing them from crumbling. But Haase is the stronger of the two and Murray squanders an opportunity to level. It's the Dutchman who will serve for the set.

Nick Bollettieri
American tennis coach on BBC Radio 5 live sports extra

"Sometimes tension can make you freeze up as well, you lose flexibility. I don't believe it's the weather. He says he is in the best shape he has ever been in. He is smiling out there, who knows, maybe he is being coy? Andy is almost like a poker player out there."

A series of errors from Haase - a double fault, an overcooked overhead -and Murray is gifted a break point. "Come on, Andy," yells a fan as if he were hailing a cab. The Dutchman unaffected - a forehand winner for deuce. But Murray gets a second chance - second break point if you wish - but pushes his crosscourt volley wide.

A monstrous winning return from Murray, but the wincing former US Open champion immediately grabs his quad and then stretches his shoulder. Murray out of sorts but has enough to win this game on one leg.

Murray's feet planted onto the court as he serves, but he comes through to hold in what is a subdued atmosphere on Louis Armstrong.

Gigi Salmon
BBC Radio 5 live sports extra commentator

"Maybe Murray feels if he can get through this set things might start to loosen up. But he's not making any height with his serve."