These 14 pictures demonstrate how relaxed Andy Murray's Davis Cup match against Juan Martin del Potro will be

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When Great Britain take on Argentina in the semi-final of the Davis Cup this week, Andy Murray and Juan Martin del Potro will contest the opening match.

But with all the Grand Slams over for the season, this is sure to be a laid back sort of match, right? Well it just so happens these two met in the Olympic final in Rio last month, so we thought we'd take a look back to see just how tranquil games between these two can be.

See how carefree Del Potro is here? Not a care in the world!

Juan Martin del Potro - (Charles Krupa/AP)

Andy Murray there, just having a quick stretch.

Andy Murray reaches for the ball - (Charles Krupa/AP)

Stretching left and stretching right. Got to have a balanced warm up.

Andy Murray reaches for the ball - (Felipe Dana/AP)

Del Potro pulls a face at Andy, such is the easy-going nature of the game. You can't see, but Andy's doing a crossword on the baseline.

Juan Martin del Potro - (Felipe Dana/AP)

Hmm, that looks a little tasking.

Andy Murray reaches for the ball - (Felipe Dana/AP)

Is that a pained expression on the Argentinian's face? Doesn't look so relaxing to me.

Juan Martin del Potro - (Felipe Dana/AP)

Err, guys? The sun's gone in. How long have you been playing?

The Olympic Tennis Centre - (Owen Humphreys/PA)

That's not sweat, is it?

Andy Murray looks forward - (Owen Humphreys/PA)

OK, so it looks like this might be hard work.

Andy Murray reaches for another ball - (Owen Humphreys/PA)

Yeah, that's definitely not a relaxed face. Anything resembling Edvard Munch's The Scream seems to indicate distress.

Andy Murray shouts - (Owen Humphreys/PA)

It's OK Andy, it's over. You won. We're sorry we doubted you.

Andy Murray looks to the sky - (Charles Krupa/AP)

Just give them a moment. At four hours and two minutes, they must be pretty shattered after that final.

Andy Murray holds his head in his hands - (Vadim Ghirda - AP)

Juan Martin del Potro rests on the net - (Vadim Ghirda/AP)

See you on Friday for more of the same, fellas?

Andy Murray and Juan Martin del Potro embrace- (Charles Krupa/AP)