It's important when you look at the US Open final between Roger Federer and Andy Murray, you applaud just how well Federer played.
Andy has had an unbelievable tournament and he played some incredible tennis, especially against Nadal.
But, in the first and third sets and some of the second, Federer justified why so many people say he's the best player to ever have played the game and I think he definitely is.
Federer was the best player I played against and I played Pete Sampras seven times.
I played Federer 13 times and his game is so complete, there are no holes in his game that make you feel you can attack.
I really think Andy can go on to be number one and win not just one Slam but multiple Slams
Every point you have to work hard for and now he's got another Slam under his belt he'll probably kick on and go some way past Sampras's record of 14 Slam titles.
However, I really think Andy can become number one in the world.
He's only 21 and even from Wimbledon, when he reached his first Slam quarter-final, it's amazing how much his game has improved.
Admittedly the conditions are different in New York and I think they do suit his game better than the grass of Wimbledon, but he has got so many areas that he can still improve on.
Andy's backhand is as good as there is in the game right now but I think he can be a lot more aggressive off his forehand.
We've seen what effect it has on his game if he serves as well as he did against Nadal - if he can serve like that more often he is going to hold serve very, very comfortably.
It's a process he is so desperate to go through and achieve that I really think that he can go on to be number one and win not just one Slam but multiple Slams.
The experiences Andy has had over the past fortnight - beating Nadal, getting to his first Slam final and now having lost - will motivate him to work even harder.
Next time he plays a Slam - in Australia, where the conditions are really good for him - he'll really believe he can go all the way and win that tournament.
It's going to be a lot of fun to watch.
I really think defeat could be much better in the long run for Murray.
I say that because he's not quite good enough yet and sometimes a loss early on in a Grand Slam final helps you understand exactly what you need to do in the future.
Murray is a smart player and I'm sure he'll use this defeat in a positive way.
He has reached number four in the world and I think he'll stay up there. He's added some strength, he hits the ball a bit harder and he always finds the best way to play against every player.
But in the final, Federer was just way too good.
I think Federer has realised he has to start being more aggressive by attacking the net because he can't hit people off the court anymore - especially guys like Rafael Nadal, Novak Djokovic and now Murray. They're too fast, they move too well.
This is a huge moment for Federer. I was one of those critics who maybe thought the days of him winning Grand Slams were over.
After this, I would say he's going to win more Grand Slams, many more, if he continues to play with the kind of passion he has now.
It was an unbelievable performance against Murray and I'm now 100% convinced he will break Pete Sampras's record.
Murray had a great tournament but I think the whole occasion was a bit too much for him in the final.
After a tough semi-final against Nadal, he needed to play the best tennis of his career against Federer and he just couldn't do it.
Nadal was flat in the semi-final. He doesn't really like the courts at Flushing Meadows and Murray disposed of him very well.
But Federer is something else. He just seems to play that much better in New York than almost anywhere else in the world.
People have been saying his best days are behind him. To be fair, that's probably true but he still played very, very good tennis throughout the tournament and he was just so determined to win.
Murray was a class act in the final and he lost to one of the best players of all time
With his experience, attitude and game plan, it was always going to be tough for Murray.
The Briton had to play at his best and serve at his best, and he didn't do that.
Federer - aside from a tricky time in the second set - just bludgeoned him.
Murray has broken through though. He has shown himself as a real threat to the top three in the world.
I think there's still a little gap between the top three and the rest, but Andy deserves to be number four, no doubt about that.
It's not inevitable that Andy will win a Grand Slam but it's definitely not impossible because nothing is impossible for Andy Murray right now.
Andy is very talented and that gives him a big edge over the majority of tennis players all over the world, he's right up there.
He has desire and a vision of what he wants but he's also grown a lot in terms of maturity - we've seen that every month and every year.
In my opinion there is no formula, the LTA is there to assist and provide us much help as possible, but ultimately it is the players who have the keys to success.
Andy made the decision to get people around him to make him fit and prevent injuries and that has been a key element in his success this year.
What has happened in the last fortnight has been great and it's not going to be the last time this happens to Andy, I'm pretty sure of that.
Even though he lost, I still expect Murray to get a beautiful reception back in the UK and inspire a lot of kids to start playing the game.
He did a great job in the final, but Federer was just too good.
You could see Murray was despondent afterwards. His expectations were high. They needed to be.
He went out there, gave it a good try, and he never quit. He was a class act and he lost to one of the best players of all time.
He had a great run to the final and not many people who start playing the game manage even that.
Tim Henman, Mats Wilander, Pat Cash and Jeff Tarango were speaking to BBC Radio 5 Live. Steve Martens was talking to BBC Radio 4