"I try to behave as good as I can, but I can always improve that, for sure," says Murray with a slightly embarrassed grin.
Andy Murray - Martin Kližan
French Open men - 1 June 2017
French Open – Follow the Tennis match between Andy Murray and Martin Kližan live with Eurosport. The match starts at 17:00 on 1 June 2017. Our live coverage lets you follow all the key moments as they happen.
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"He can hit winners from anywhere on the court," says Murray of Klizan. "I tried to play a solid match...when he's controlling with his forehand, it's very difficult."
Next up for Andy Murray - Juan Martin del Potro.
MURRAY 6-7 6-2 6-2 7-6 KLIZAN: Well, that was hard work, but Andy Murray is through in four sets. Klizan proved a tricky, aggressive opponent, but Murray's instinctive return on match point finished things off.
MURRAY 6-7 6-2 6-2 6-6 KLIZAN: Three aces for Andy Murray, and we are into a tie-break. Both players are throwing everything at this, both players look fairly miserable.
MURRAY 6-7 6-2 6-2 5-6 KLIZAN: Two break points saved by Martin Klizan as Murray keeps him moving. Important hold there.
MURRAY 6-7 6-2 6-2 5-5 KLIZAN: A screaming baby interrupts Murray as he's about to serve it out, but he's uncharacteristically patient as Klizan smiles a pained smile.
MURRAY 6-7 6-2 6-2 4-5 KLIZAN: Andrew Barron Murray, that's some exceptional tennis. Klizan is responding with desperation, including a wild smash on the final point, but Murray is currently boasting nerves of steel.
MURRAY 6-7 6-2 6-2 3-5 KLIZAN: A stream of cursing from Murray as he loses the first two points of the game, but he recovers himself enough to hold.
MURRAY 6-7 6-2 6-2 5-2 KLIZAN: One more game for Klizan, heading towards a decider. Both players immediately go to their chairs to cool down with some ice.
MURRAY 6-7 6-2 6-2 2-4 KLIZAN: Ivan Lendl is unmoved, as he generally is. We're closing in on the three-hour mark here as Murray holds.
MURRAY 6-7 6-2 6-2 1-4 KLIZAN: No sign of any stiffness or hampered shoulder rotation or power from Klizan now as he blazes ahead in the fourth.
MURRAY 6-7 6-2 6-2 1-3 KLIZAN: A hold of serve for Murray after Klizan's had his shoulder rubbed for a bit.
"What is the point of being here?" asks Murray, apropos of something that isn't quite clear.
MURRAY 6-7 6-2 6-2 0-3 KLIZAN: Klizan holds and then gets medical attention for his shoulder, while Andy Murray complains loudly at his box about something.
MURRAY 6-7 6-2 6-2 0-2 KLIZAN: Maybe he doesn't need medical attention. Great angles to break the Murray serve.
MURRAY 6-7 6-2 6-2 0-1 KLIZAN: Klizan holds under pressure, then asks for some medical attention. He isn't allowed though. Murray to serve.
MURRAY 6-7 6-2 6-2 KLIZAN: More lovely Murray attack at the net to secure this third set. When the Murray footwork is that on point, there's almost no reason for Klizan to bother being on court.
MURRAY 6-7 6-2 5-2 KLIZAN: Up to Murray to serve it out and go into a fourth now.
MURRAY 6-7 6-2 5-1 KLIZAN: Klizan is sliding all over the place in an effort to keep up with Murray's revised game plan.
MURRAY 6-7 6-2 4-1 KLIZAN: This isn't the very best of Andy Murray, but Martin Klizan hasn't capitalised on the chances he's had. Losing serve like that doesn't help.
MURRAY 6-7 6-2 3-1 KLIZAN: Sizzling from Murray now, 18 minutes into the third, and Klizan is just lost.
MURRAY 6-7 6-2 2-1 KLIZAN: Murray's won the last seven games, but Klizan stops the rot.
MURRAY 6-7 6-2 2-0 KLIZAN: Klizan is exasperated with himself, failing to break the Murray serve despite opportunities.
MURRAY 6-7 6-2 1-0 KLIZAN: Murray's looking focused and relaxed and once more enjoys moving to the net to make Klizan look lost.
MURRAY 6-7 6-2 KLIZAN: Murray roars and chunters as he finishes off this second set - he's played himself into this.
MURRAY 6-7 5-2 KLIZAN: Murray goes two breaks up as Klizan sends a cross-court shot wide of the line. There's a subtle fist pump but the Murray machine is back on the road.
MURRAY 6-7 4-2 KLIZAN: Great movement from Murray now after those complaints at the start of the set. He consolidates his break and is looking much happier.
MURRAY 6-7 3-2 KLIZAN: That's the break for Andy Murray, facing down the Klizan serve with more aplomb than he's managed for a while.
MURRAY 6-7 2-2 KLIZAN: A hold to love for Murray, so easy, and another ace to finish it off.
MURRAY 6-7 1-2 KLIZAN: Klizan has recovered some of that composure he lost after Murray won three straight games in the first set, and he holds serve almost casually.
MURRAY 6-7 1-1 KLIZAN: Murray has been complaining to his team in the stands, which is pretty usual. He's not happy with the way he's covering the court.
MURRAY 6-7 KLIZAN: Ivan Lendl has a cold towel round his shoulders as he watches his boy in this tie-break. It also sounds like Murray threatens to sit down in his chair the next time the overhead camera moves. The world number one is not a happy man, double-faulting to gift Klizan three set points, and he takes the first.
MURRAY 6-6 KLIZAN: Into a tie-break it is then to settle this first set. Murray looks fired up.
MURRAY 6-5 KLIZAN: Klizan is hanging his head, obviously thinking about his loss of serve in the last game. Murray is roaring as he sends down his bullet serves.
MURRAY 5-5 KLIZAN: Ah, that's some guts from Andy Murray, who's managed to niggle Martin Klizan into making some simple errors. Level up.
MURRAY 4-5 KLIZAN: Andy Murray holds serve, but now Klizan is going to get the chance to see this out - he has looked incredibly solid.
MURRAY 3-5 KLIZAN: Murray is being left utterly statuesque at the baseline by Klizan's sheer power - but when the Slovak comes to the net, he struggles.
Klizan is getting exasperated with someone wandering up the stairs as he's about to serve.
MURRAY 3-4 KLIZAN: That's so Andy Murray - following up a double-fault with a magnificent ace.
MURRAY 2-4 KLIZAN: More belting forehand work from Klizan as Murray stands on the baseline. His nerve fails as he double-faults to allow the world number one a glimmer of hope, but he manages to recover and serve it out.
MURRAY 2-3 KLIZAN: After the now-customary Murray complaint about a camera over the court, his footwork lightens a touch as he dances to the net. Hold to love - just what he needed.
MURRAY 1-3 KLIZAN: Klizan's forehand is blistering, and Murray isn't putting any pressure on him now.
MURRAY 1-2 KLIZAN: Early break for Martin Klizan. Andy Murray is glowering and chuntering, and you wouldn't expect anything else from him.
MURRAY 1-1 KLIZAN: A straightforward hold for Klizan.
MURRAY 1-0 KLIZAN: Well, that was a battling start from Murray, who's trying to test Klizan's movement a little, and targeting the backhand.
Murray is in a white shirt with a black baseball cap and will serve in this first game.
Aga Radwanska has just beaten Alison van Uytvanck, so Murray and Klizan will be on Court Suzanne Lenglen shortly.