Agnieszka Radwanska progresses to finals of WTA Championships

Agnieszka Radwanska will play the winner of the Maria Sharapova - Petra Kvitova semi-final later today in the finals of the tournament.

And it's all over. Radwanska beats Garbine Muguruza in three sets - 6-7, 6-3, 7-5

Match point remains for Radwanska, who's up 40-30. It's the second.

Radwanska's up 6-5 in the third set as Muguruza serves to stay in the match.

And Muguruza pulls off a stunner to go 4-4 in the third set after being in a losing position.

A blisteringly fast ace from Muguruza sees the game at deuce as the Spaniard attempts to hold to equalise.

It's still anyone's match! Muguruza stages a comeback to go 3-4 in the third set.

Just when she seemed down and out, Muguruza comes back to go 2-4 in the third set. Radwanska is in visible pain.

Radwanska holds serve to go 4-1 in the third set, and looks on course to seal victory and a finals berth at the WTA Championships.

Muguruza holds to take her first game of the third set!

Muguruza is flagging again - she's only taken 4 points this set, trails Radwanska 0-3 in the third set.

If Radwanska wins today, she will be only the 2nd player after Venus Williams to have lost two round robin matches and still progress to the finals at the WTA Championships.

Radwanska breaks to go 2-0 in the third set.

Break point for Radwanska! She's won 5 of the 10 she has faced in this match so far.

Radwanska continues to dominate, and she's up a game in the third set.

Set point Radwanska! Muguruza took the first set 7-6 as Radwanska takes the second 6-3! It'll be a three-setter today!

Game point for Muguruza.. and Radwanska hits a backhand winner. Deuce!

Radwanska now looks to hold for a 4-0 lead in the second set. A three-setter today, perhaps.

Break point! Radwanska takes 3 games in a row in the second set; Muguruza has not yet taken a game.

Radwanska holds, and now leads 2 games to love in the second set.

An aggressive Muguruza hit 23 winners to Radwanska's 9; she also, however, committed 18 unforced errors.

Muguruza wins the tiebreak to take the set! 7-6 to the Spaniard who was trailing in the tiebreak before coming back in dramatic fashion.

3-1 to Radwanska in the tie-break.

Muguruza holds! The first set will go to a tiebreak.

Muguruza charges on the second serve in a form reminiscent of the SABR to take a beautiful point against Radwanska. 30-15 in the 12th game.

If Muguruza holds, this match will head to a first-set tiebreak.

Game Agnieszka Radwanska! 6-5 to the Pole.

Three straight games to Garbine Muguruza, and it's now break point as she looks to take a 4th.

And Muguruza levels 4-4.

A blistering comeback from Muguruza who is quickly closing out Radwanska's 4-3 lead.

Radwanska takes a 4-1 lead, but Muguruza returns to take the next game without conceding a point. 4-2 to the Polish ace.

A thundering 3-1 lead to Agnieszka Radwanska, who has dominated her Spanish opponent so far.

Break point! Radwanska looks to set to take this game as well.

Muguruza is faltering in this match - 3 games in and she's already committed 8 unforced errors.

Muguruza has added more topspin to her forehand, says coach Sam Sumyk.

Radwanska breaks to take the 2nd game from Muguruza. 1-1 in the first set.

Muguruza closes out the first game.

Deuce! Both players are even in the first game of the first set with Radwanska looking to hold.. but it's advantage Muguruza.

Spanish Muguruza has beaten Radwanska 3 times this season already.

Muguruza is the stronger of the two competitors at today's match, having won all three of her round robin games, two in straight sets.