"Producer Steve" is a nice bloke because occasionally, very occasionally, he gives us a few hours off to recover from the latest five-set marathon here at this amazing Australian Open.

My colleague Alastair Eykyn tends to go running or swimming because he's fit like that, while David Law, another of our Five Live Sports Extra commentators, either sleeps or goes to the casino to watch West Brom.

Me? Well I like to explore the city, seek out some backstreet cafe for lunch and perhaps purchase something for my 18-month old daughter to look at and then ignore.

But today (in addition to the above!) I found myself strangely drawn back to the tennis centre because Djokovic was playing on Court 19.

Not Novak, the number 3 seed, but his 16 year old brother Marko.

Djokovic junior lost his first round match in the boys singles but it was good to get a first look at a kid who, according to Nicki Pilic, the German whose academy Marko attends, has comparable talent for his age.

There's a third brother by the way - Djorge, 11, might possibly turn out to be the best of the bunch.

But as well as enjoying Marko's tennis (and the similarities to Novak's game were noticeable, particularly during the first set which he won) I couldn't help thinking whether the Djokovic kids would ever turn up for a practice session without their rackets.

Would they miss the bus to training and remain uncontactable for a few hours?

Would they annoy their coaches so much they'd get sent home from a trip on the other side of the world?

It's unthinkable.

I bet they get up to schoolboy pranks every now and then but when it comes to tennis, the Djokovic-clan is a single-minded family.

All three kids want to get to number one in the world (it's not inconceivable that they may form a remarkable chain of succession post-Federer) and they know what it's going to take to get there.

But what of Marcus Willis, the British number two junior who was sent home in disgrace on Sunday?

What about the many British players who were forced to lock websites last year after being daft enough to leave personal photos and confessions open to the world?

Do they want to be number one players?

It's time some of these jokers stopped sponging off the system and woke up to the reality that they aren't as hungry for success as kids like the Djokovic boys.

The job centre awaits for the worst offenders and maybe then the wakey-wakey alarm bell will ring.

Willis' dismissal wasn't the only disappointment of Sunday - Paul-Henri Mathieu's resignation against Rafael Nadal was a great shame.

He received some treatment to his left calf in the first set but after about half an hour it was pretty clear that he didn't fancy a thrashing from Nadal at less than full fitness.

When he quit, at 3-0 down in the second set he acted like a spoilt schoolkid, fuzzing his racket into his chair and trudging off court, boos ringing in his ears.

Presumably he then stomped up the stairs and slammed his bedroom door shut. I wonder what his coach made of it, that great competitor Mats Wilander.

Fortunately, we've seen some magnificent tennis here to far outweigh the disappointments.

You can already frame Safin/Baghdatis, Federer/Tipsarevic, Kohlschreiber/Roddick and Baghdatis/Hewitt as perfect examples of five-set Grand Slam contests while Blake/Grosjean was the invisible classic, happening over on Vodafone while the drama of Super Saturday was unfolding on Rod Laver.

The women's tournament has lacked a classic contest in recent days but look at the heavyweight names left in. Henin, Sharapova, Serena, Venus, Ivanovic and Jankovic will all fancy their title chances and I still go with Henin to raise her game in the final stages.