Roger Federer vs Stefanos Tsitsipas live score, results and updates

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Stefanos Tsitsipas goes on to his first-ever final here. It's been an excellent year for the Greek.

WHAT A PHENOMENAL PERFORMANCE BY THE GREEK! HE DEFEATS ROGER IN 6-3, 6-4.

TSITSIPAS EMERGES AS THE BETTER PLAYER TODAY AS HE MAKES IT TO HIS FIRST FINAL IN LONDON ON HIS DEBUT YEAR!

Tsitsipas fires an ace in the blink of an eye. HE WINS THE MATCH IN STRAIGHT SETS.

Federer's return falls long as Tsitsipas gets a match point!

Tsitsipas brings it to deuce once again.

FEDERER HAS TWO BREAK POINTS!!! HE MUST CONVERT NOW!

A long return from Tsitsipas and it's 15-30.

A slow return from Roger and it's 0-15 to Roger. THIS GAME IS A DO-OR-DIE AFFAIR FOR ROGER.

Tsitsipas will serve for a spot in the finals now.

Roger manages to hold! He trails behind at 5-4. Can Roger pull off a comeback now?

Tsitsipas pushes Roger to another deuce! What is this match!

Federer squanders away points. It's 30 ALL.

It's 15 ALL on the Roger serve.

Federer must hold now to stay in the tournament.

Tsitsipas is relentless today. He leads the way at 5-3.

A second double fault for the Greek and it's 15-30 to him.

A brilliantly timed return from Roger and it's 15 ALL on the Tsitsipas serve.

Federer holds comfortably. It's 4-3 now. Federer must break again NOW.

The unforced errors keep mounting for Roger. However, he is up 40-30 on his serve.

Federer moves into some serve and volley and it's 30-0 on his serve.

Tsitsipas claims the game and leads 4-2.

Tsitsipas makes Roger race around the court and the age difference really comes in now. Tsitsipas leads 40-15.

Can Federer pull off another comeback?

Into the sixth game of the second set, it's 15 ALL on the Tsitsipas serve. Things look really tense on court.

Tsitsipas leads the way yet again at 3-2. Can Roger break the motivated Greek again?

This is really grueling tennis. Tsitsipas breaks Roger again!

Tsitsipas has the break point again. The pressure is really high in this game.

Federer ends up handing another break point to Tsitsipas. Thankfully, Roger urges a deuce.

FEDERER BREAKS TSITSIPAS! WHAT A MATCH! IT'S 2 ALL.

A brilliant drop shot from the Federer racket and it's ADVANTAGE to Roger.

Federer drops another winner and it's 40 ALL.

Tsitsipas levels up yet again. What is this match. It's deuce!

A ROAR FROM FEDERER AS TSITSIPAS' RETURN FALLS WIDE! C'MON ROGER!

Tsitsipas is relentless today as he gets the break. He leads 2-1. Federer really needs to push now.

Tsitsipas powers on early and has 3 break points on the Federer serve.

A comprehensive service hold by the Swiss. It's time for Tsitsipas to serve now.

Into the second set, Federer begins proceedings. He leads 30-0.

Tsitsipas gets a 7th SET POINT and finally converts it. What a hold from the 21-year-old! He gets the first set and leads 6-3!

Roger once again keeps him away from the set. It's deuce.

Roger's return finds the net. Tsitsipas gets a set point.

It's back to deuce once again!

After a 23 shot rally, Tsitsipas ends it with a winner. Set point again for the Greek.

Federer stops him AGAIN with a down-the-line winner!

Another ace from the Greek and it's set point.

Federer's backhand falls wide. And back to deuce.

AND FEDERER GETS YET ANOTHER BREAK POINT!

It's SET POINT once again for the Greek. Roger stops it again. Back to deuce. Whoa!

A double fault comes in for Tsitsipas. Roger must push him now. Back to deuce.

Roger Federer vs Stefanos Tsitsipas live score, results and updates - Nitto ATP Finals 2019 Semi-Finals

Stefanos Tsitsipas defeats Roger Federer in straight sets and goes on to his maiden final in London!