As a nation weeps over its cornflakes this morning, I want to say that I am convinced more than ever that in Andy Murray, we have a future Grand Slam champion.

What seperated the Scot and his American opponent, Andy Roddick, in their four-set, two-tie-break semi-final was just a few crucial points, no more, in an excellent, skiful and passionate match.

The outcome, I sensed, hinged on the first set in which Murray had a set point and Roddick had a Yankee slice of luck. Also what separated them was what money can't buy: it's called experience.

Murray has previously been in a US Open final and a Wimbledon quarter-final, but you and I can only imagine what it must have been like for him this past fortnight with the kind of mass intrusion into his every private thought and action.

At one stage on Centre Court on Friday afternoon, as nervous energy levels began to be stretched, he reacted grumpily and had to be rebuked by the umpire. That was when we had a glimpse of the weariness he had tried so hard to disguise.

As for Roddick, I have never seen this off-the-cuff buccaneer play with such savy and reticence - and yet retain his most feared weapon. His first-serve percentage was 75 per cent. Just think of it.

He now prepares for his third Wimbledon final against Roger Federer's impeccable class, which predictably overcome Tommy Haas' best efforts.

Federer, who collects tennis the way I used to collect Frank Sinatra's, is after a record 15 Grand Slam titles in what will be his sixth successive Grand Slam final.

Before that thoough on Centre Court today, two sisters who broke free from the rough streets of Los Angeles, will face each other for the fourth time in a Wimbledon singles title. I mean of course, Venus and Serena Williams, who have proved that the impossible is sometimes possible.

This will be the fourth time they have have done this; Serena has won twice, Venus once but the latter is going for her sixth Wimbledon title which will equal Billy Jean King's record. Their overall record against each other around the world stands at 10 matches apiece.

To me though, there is something still more remarkable about the Williams sisters. It is this: they simply love to play each other, whether on a practice court or for the world's most prestigious championships. To them, it's that old thing called fun. Remember it?

Best friends usually hate to play each other on a tennis court, particularly at serious tournaments. Yesterday they had fun playing together in the semi-finals of the women's doubles against Cara Black and Liezel Huber (Zimbabwe and USA in tandem). They won 6-1, 6-2 and it was like a chat show!

Aterwards sitting in front of the world's press with a giggle never far away, they were eventually asked 'is there anything you want to ask one another?'. Serena glanced at Venus and with a smile replied: "Yeah... are you ready to get out of here?". The hard noses of the Fourth Estate simply loved it.

As for my final prediction for the sibling battle on Centre Court this afternoon, because of the relationship between the Venus and Serena, it's always difficult to call.

But it is worth noting that between them, they have won seven Wimbledon titles of the nine contested in this decade, which is just amazing.

And two things point me in the directon of Venus. One is that the more I watch them together and hear them together, I get the feeling that Serena looks up to Venus for leadership and perhaps that will mean something on court today.

The other is that Venus is going for that sixth singles title, so if pushed, I will lean towards her.

Today's final thought is there was a time when you thought Wimbledon moved at too regal a pace, but not now.

With great levelness of thought they yesterday organised for spectators without Centre Court seats but with ground passes to watch the battle of the Andy's on a giant screen erected in a new, sunken number two court bowl.

Who says they don't move with the times here? I for one used to, but not any more. There's been a revolution.