Great Britain's 3-2 win over Russia in the Davis Cup shows that if there is a belief in a team and the team pulls together, very strange things can happen.
The doubles win to claw the tie back to 2-1 on Saturday with Colin Fleming and Jonny Marray winning was pretty predictable because we have a fine doubles unit, but the reverse singles were astonishing really. James Ward, ranked 214th in the world, was the crucial one to beat Dmitry Tursunov, number 67, who is talented but very inconsistent and a bit of a loose cannon.
Credit must go to Ward for battling away, especially after his loss on Friday. Meanwhile Dan Evans, world number 325, was a great call from the captain Leon Smith. He just went through Evgeny Donskoy to complete the win in straight sets.
A lot of people I spoke to before the match weren't too happy with the decision not to play Jamie Baker because he is a top bloke with a great attitude and serves well.
Dan Evans' commitment has not really been the same as Jamie Baker's. It was a gamble because the talent and the potential were there. But was the performance going to be there? You couldn't be sure.
Credit to Leon Smith for making that choice. Dan Evans showed what a capable player he is, but he also showed that he wasting his talent.
From all accounts, Andy Murray wasn't overly committed before he left for Spain as kid. But he was different beast when he came back from learning his trade abroad.
It is not too late for Dan Evans at the age of 23. It is all well and good doing it in front of a packed British crowd, but a bit different doing it in on hot day on the Challenger Tour in front of nobody.
Does he have it in him to improve? That must come from within. Does he has the attitude and the work ethic to come good?
He is a player of some finesse, but I'm not sure that approach really works these days. He has the talent to be well inside the world's top 100, but there must be improvement mentally and physically to ensure his efforts are not reserved for the odd Davis Cup match here and there.
Hopefully, this will be the kick up the backside he needs because he should be way above where he is. Smith has instilled a real belief among him and the players that they can compete at this level.
Leon was a former coach of Andy Murray's. He is a young man, relates well to the players and gets the very best out of them.
The defeat must have been a huge blow to Russia, who seemed surprised we got so close on the first day only to fall 2-0 behind.
The draw to get back into the World Group is on Wednesday. I think a home tie in the play-off could be key. These guys know a home tie will cement their confidence.
Murray will be back. It is a long time between now and September. Evans must be knocking on the door to be involved again.
Whoever we play, we have a good chance because you would back Murray to win his singles.
I couldn't pick a team that would without question beat us. A home tie with Australia would be good. As would Japan.
Germany might be tough. Switzerland? Will Roger Federer be back? That could be difficult. Even the away ties would not be beyond us against the Spanish. Murray is not too shabby on clay.
I think we have a favourite's chance whoever we come up against, but home support makes so much of a difference.
Great Britain's potential opponents in World Group play-off
Ties to be played on September 13-15
1st seed: Spain - away
2: Austria - away
3: Croatia - away
4: Switzerland - home
5: Germany - home
6: Australia - home
7: Belgium - away
8: Japan - decided by lot