So all that is left is to point you in the direction of Piers Newbery's match report.

We will back at 17:30 GMT on Sunday, with live text commentary of what promises to be a thrilling final. Thank you for joining us, and hope you enjoyed it as much as we did. See you soon. Bye for now.

What a match. The best of the tournament. And Roger Federer has to do it all again inside 24 hours. The final tomorrow sees the world number one Novak Djokovic against the world number two. It begins at 18:00 GMT. Make sure your schedule is cleared.

Image source, AFP

Here's Roger Federer: "I think I got lucky tonight. Stan played better from the baseline and that usually does the job on this court. But I kept fighting. It's tough but I'm thrilled to be in another final in London.

"Novak is playing great tennis. It usually brings the best out of me, it's going to be tough but I'll give it a shot."

David Law
BBC Radio 5 live sports extra commentator

"Poor old Stan Wawrinka. He could not have done any more. He threw the kitchen sink at Federer and even served and volleyed. He leaves the arena to a standing ovation."

Image source, AFP

What resistance shown from Roger Federer. He had to save four match points, but somehow he has held on and booked his place in the final.

Wawrinka looks absolutely devastated as he trudges off the court.

Djokovic versus Federer tomorrow in the final. Make sure you do not miss it.

Federer is closing on a ninth appearance in the final of this event. A delicate drop shot takes him to within one point.

Fourth match point for Wawrinka. But it's a big Federer serve down the middle and Wawrinka's return goes long. Another missed opportunity. How many more chances will he get?

But Wawrinka holds on. Back on serve in the tie-break.

Image source, AFP

A passing shot down the line, is in by a quarter-of-a-ball's width to take Federer 4-2 ahead. He needs three more points for a place in the final.

Federer dominates the net to move 3-1 ahead in the tie-break. A scorching shot finds the corner from Wawrinka and the advantage is lost.

First mini-advantage for Federer. And Wawrinka, who nets with a backhand, looks in pain as he clutches his thigh.

Leon Smith
GB Davis Cup captain on BBC Radio 5 live sports extra

"Wawrinka deserves to find himself in the tie-break. It was a brave hold and it will be interesting to see how this goes."

Federer two points away from victory, but Wawrinka fights back from 15-30 down to win the next three points. Tie-break time.

Leon Smith
GB Davis Cup captain on BBC Radio 5 live sports extra

Image source, AFP

"Wawrinka is going to have to call on all his inner strength to hold here."

Federer leads. What drama in the O2 Arena in London. Wawrinka, who had three match points to move into the final, is now serving to save the match.

A backhand winner down the line, followed by a forehand cross-court winner gives Wawrinka 0-30 on Federer's serve. An unforced error from the world number two, dragging one wide, gives Wawrinka two break points, which Federer then saves. We may be here for a while yet.

Stan Wawrinka is going to have nightmares about this match for a long time if he does not win it. Three times he was on match point on his own serve. Three times he failed to get over the line.

Federe then breaks his serve in a thrilling and dramatic game. We are now back on serve. Federer breathes again.

David Law
BBC Radio 5 live sports extra commentator

Image source, AFP

"There are people bowing to Roger Federer in the crowd, waving flags and high-fiving each other."

That's three match points saved from Federer.

Wawrinka saves a break point, and hauls it back to deuce after a 21-shot rally. He then has his second match point with a volley at the net. Federer can't get there and hits his chair with his racquet. One more point for glory.

But wait. A volley at the net would normally be routine for Wawrinka. Match point against Federer is not a normal situation and Wawrinka punches it into the net from close-range.