Four things learned from Andy Murray's eventful training session with brother Jamie at Wimbledon

All smiles

Arguably the biggest thing - especially for Andy - is that he was out there and seemingly enjoying it all.

The practice session started at around 1.30pm BST, just a few hours after it was announced that he was withdrawing from the singles draw.

That would have hurt the three-time major champion not being able to play in the singles draw at Wimbledon one final time.

But he was able to put that disappointment behind him and was all smiles with his brother Jamie out on Aorangi.

Coaches Jonny O’Mara and Alan MacDonald joined in the fun with plenty of jokes and laughter between the entire group.

No holding back

While there was certainly a more light-hearted mood to Andy's practice session on Monday, that didn't stop the former world No 1 from putting on a clinic for those watching.

The freedom of movement may still not be there entirely, but Andy was showcasing just how close he felt to playing in the singles.

He was hitting baseline after baseline with his ferocious forehand and showed no mercy whatsoever to his brother when he came to the net for some volley practice.

Make no mistake about it, Andy will be doing everything to prolong his Wimbledon career just that bit longer when the doubles draw gets underway.

Some frustrations

That competitive spirit was on full display throughout the long practice session with Andy regularly berating himself for failing to keep the ball in play.

At one stage Murray even smashed the top of his racket on the floor after seeing another shot drop into the net.

He'll want to tidy up his game by the time he takes to the court with his brother, but those frustrations at not being perfect all the time is arguably why Andy reached the pinnacle of the sport once before.

Every elite sportsperson needs that hunger to improve and Andy still has that even with his career set to end later this summer.

Fitness concerns

The biggest concern will be surrounding Andy's fitness levels and how his body reacts to a competitive match.

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He's now had two long practice sessions at Aorangi Park to start the week and there have been plenty of grimaces from the 37-year-old in both of them.

Andy won't have to do as much running in doubles and that will certainly help his chances.

But it's barely been a week since he underwent surgery and anything can happen between now and the time he takes to the court.