Caroline Wozniacki outfought Angelique Kerber to win an enthralling Qatar Open quarter-final on Friday and ensure she will remain world number one.
The Dane recovered from going a break down in the first set and responded to a disappointing dip in the second to record a 7-6 (7-4) 1-6 6-3 victory over Kerber, who won more points than her opponent but was left to rue too many missed chances.
Victory for Australian Open champion Wozniacki – a beaten finalist in Qatar 12 months ago – means she will keep her place atop the rankings after Simona Halep withdrew with a foot injury, having defeated CiCi Bellis to reach the last four.
In a competitive opening it was Kerber, who had already saved a couple of break points, that broke first with a sensational forehand down the line.
Kerber showed great determination to save more break points, before it was Wozniacki's turn to play on the back foot in a mammoth game seven - some brave work on two separate break points keeping her in the set.
It proved a crucial moment as Kerber, serving for the set at 5-4, was broken back by an exquisite forehand return.
The German missed three break-point chances to regain the lead and Wozniacki, having missed with a set point in game 12, controlled the tie-break.
Kerber quickly channelled her frustration to dominate the second set, although a notable dip from Wozniacki played its part.
The Dane put an easy overhead into the net and followed up by going wide to offer up one break, before another wild overhead gifted Kerber a 5-1 lead.
Wozniacki appeared deflated and was comfortably broken again at the start of the decider, but she rallied from 40-0 down in the next game to level immediately at 1-1.
That halted Kerber's momentum and, after some gripping tennis by both players, Wozniacki stole a march in game eight as more excellent defensive play led to a break point that Kerber put wide.
And Wozniacki held her nerve to serve out for the match and punch her ticket to the semi-final.
|Croatia cut Messi off in Argentina thrashing - Modric|
|Pogba: Kante, Matuidi have 15 lungs|
|Julian Nagelsmann: the Bundesliga prodigy swapping Hoffenheim for RB Leipzig|
|England dominate in Durham to close in on series whitewash|
|´Fortunate´ Federer closes in on Halle title|
|Calamity Caballero and Sampaoli tinkerings leave Argentina a broken mess|
|Wimbledon champion Muguruza confident despite Birmingham defeat|
|Argentina 0 Croatia 3: Caballero drops clanger as Messi´s men are stunned|
|Funes Mori departs Everton to join Villarreal|
|Djokovic beats Dimitrov as Kyrgios lays down a marker|
|Relegated Verona appoint World Cup winner Grosso|
|Trotz named Islanders´ new coach|
|Matic and Serbia ready for ´hellish´ Switzerland clash|
|Fleetwood flounders as Gros takes Pulheim lead|
|No attacks on Neymar, pledges Costa Rica boss Ramirez|
|Giroud return brings structure to France, but again they disappoint|
|Brighton sign Sunderland goalkeeper Steele|
|Schmeichel and Eriksen blast ´exceptionally harsh´ VAR penalty|
|Nigeria´s young World Cup squad learning on the job - Rohr|
|Moody: England players need protection|
|France 1 Peru 0: Mbappe books last-16 spot with record goal|
|I don´t need anyone to hold my hand - Verstappen|
|Captaincy comes back around to Silva as 2014 pain fades|
|We don´t want to be losers - Petkovic|
|Alba not interested in Barcelona exit as Tottenham rumours swirl|
|BREAKING NEWS: Nagelsmann to take RB Leipzig role in 2019|
|Messi cannot be compared to Maradona, claims Argentina World Cup winner Kempes|
|Mbappe sets France record with maiden World Cup strike|
|Federer comes through tough Halle test|
|Nagelsmann to leave Hoffenheim amid RB Leipzig rumours|
|Gerrard brings former Liverpool team-mate Flanagan to Rangers|
|Cipriani to be ´the calmest guy in the room´ on England return|
|C´est magnifique! Lloris earns 100th France cap|
|Belgium v Tunisia: Hazard hoping for World Cup lift off|
|WATCH: Manchester United ditch piano to welcome Fred the red|
|Hamann springs to defence of Ozil|
|Alonso non-committal on future after Le Mans triumph|
|McInally returns to Scotland starting line-up|
|Giroud & Matuidi start as Deschamps drops Dembele for Peru|
|Torreira focused on Uruguay amid Arsenal links|
|NBA Mock Draft 2018: Deandre Ayton leads intriguing first round|
|Tite will not take away Neymar´s ´genius´|
|Australia show promise but calls for Cahill ignored amid lack of cutting edge|
|Manchester United means greatness - Fred aiming for titles following Old Trafford switch|
|Denmark 1 Australia 1: Jedinak strikes back after Eriksen rocket|
|Neymar not being put at risk by Brazil, says Tite|
|Juventus complete signing of free agent Emre Can|
|Fred completes Manchester United switch|
|Dembele will not join a Spurs rival|
|What were the 0.4 per cent doing? Iceland captain marvels at TV audience|
|Forsberg ready for ´next big step´ after RB Leipzig|
|´Retired´ Brits on bench as Springboks ring changes for final Test|
|Meninga: Key Kangaroos positions up for grabs in Origin|
|FIFA gets shirty over Ronaldo claims|
|Soyuncu keen on Arsenal switch|
|Atmosphere much better after criticism, says Hummels|
|FIFA issues statement after ´questionable´ Amrabat decision|
|Cipriani and Robshaw to start for England at Newlands|
|Team Sky hit back at Hinault´s ´irresponsible´ Froome comments|
|Iran fans are the real winners as women get glimpse of the future|
|Beckham predicts England-Argentina World Cup final|
|Napoli should sign Meret, Zenga claims|
|Meticulous Mouratoglou shaping stars of the future|
|Journalist hands Khedira boarding pass for early flight home|
|Germany v Sweden: Muller upbeat ahead of huge World Cup clash|
|South Korea v Mexico: Germany´s conquerors set for role reversal|
|Chandimal appeals against one-match ban|
|Fofana and Lamerat start, Parra skipper for final All Blacks Test|
|Asia and Africa being left behind - Queiroz|
|Emre Can arrives for Juventus medical|