Coco Gauff's first WTA Tour title at the Linz Open means the 15-year-old has the prize money to buy a Halloween costume she hopes will be the best in the sport.

The outstanding teenager, who starred at Wimbledon and the US Open, became the youngest champion on the main tour in 15 years as she defeated Jelena Ostapenko on Sunday.

The victory capped a sensational week for Gauff, who also claimed a landmark first win against a top-10 player when she downed world number eight Kiki Bertens in the quarter-finals.

Despite a fast-moving week, which started with the American entering the tournament as a lucky loser, Gauff has already made plans for her reported winnings of $43,000.

"I know Halloween is coming up and it's one of my favourite times of year," she said. "So I guess I'll splurge a little bit on my costume and make sure it's right.

"[The costume is] a secret, because I know last year they had a WTA contest for the best costumes, and I came in third. This year my goal is to come in first!"

Gauff drew huge crowds as she made grand slam breakthroughs at the All England Club and then at Flushing Meadows, yet she revealed she had not expected to be in contention for titles at the start of the season.

"I'm still overwhelmed and shocked," she said. "I guess it's crazy to say it's my first WTA title.

"This was definitely not on the calendar at the beginning of the year, because I didn't think I'd have a chance to get in. And now I'm the champion, so it's crazy."

Gauff is the first player this season to win on the tour as a lucky loser and added: "It's just literally insane that I got in as a lucky loser and now I'm the champion.

"My dad told me when I got in, before the first main-draw match, he said, 'You can't lose twice in the same tournament!'

"I'm sure he never thought it would come this far, to being the champion, but I guess he was right."

Coco Gauff claimed the first WTA Tour title of her career with a thrilling 6-3 1-6 6-2 victory over Jelena Ostapenko in the final of the Linz Open.

The 15-year-old American sensation was the youngest WTA finalist since Nicole Vaidisova won the Tashkent Open in 2004 and showed plenty of the form that saw her spring to grand slam prominence this year to take the first set.

Ostapenko, the 2017 French Open champion, rallied impressively both to level matters and delay a victory that marks the latest staging post in Gauff's rapid rise.

Gauff, who stunned world number eight Kiki Bertens in the quarter-finals, was forced to save a pair of break points in the first game but immediately got stuck in to the Ostapenko serve, opening up a 3-0 lead.

Playing her first final of 2019, Ostapenko settled well enough thereafter but Gauff looked imperious, shrugging off a double fault at the start of the ninth game to take the set.

Ostapenko finally got a look at her opponent's serve in set two as they exchanged breaks early on, before the weight of what she seemed set to accomplish appeared to hinder Gauff.

It meant the second went 6-1 to the world number 72 but the pedigree Gauff displayed en route to round four at Wimbledon and round three in the US Open came emphatically to the fore in the decider.

After dropping serve for 2-0, Ostapenko got involved in an animated exchange with the umpire, repeatedly asking the official, "Can you see the ball?"

At the next change of ends, newly appointed coach Marion Bartoli sought to settle her charge but Gauff was on a roll, and Ostapenko was forced to gamely repel a pair of match points at 5-0.

Those near misses knocked the teenager, who plopped a forehand into the net to be broken to love in the next game.

She regrouped superbly, however, as both players tore into each other with all-or-nothing groundstrokes. One of those from Ostapenko was shown to be long on a challenge and Gauff let out a scream of delight, embracing a landmark triumph.

Coco Gauff says her run to a first WTA Tour final at the age of 15 shows she is ready to play at a top level.

Gauff needed a lucky loser spot to take her place in the main draw of the Linz Open after failing to qualify but could claim the title on Sunday following a 6-4 6-4 defeat of Andrea Petkovic.

The American, who reached the fourth round of Wimbledon and third round at the US Open this year, will face Jelena Ostapenko after the 2017 French Open champion booked her place in the final by beating Ekaterina Alexandrova.

Gauff saved nine of the 10 break points she faced in a superb defensive display, with the teenager thrilled by her continued rise.

"This is actually the first time in my life, including juniors, that I got into something as a lucky loser, and now I'm in the final," said Gauff. "I guess every little thing counts. You never know what it could lead to.

"Last year, around this time, I was playing a juniors Grade 1 [tournament], and I lost in the quarter-finals there, in Mexico. It's crazy how much a year can make a difference in improvement.

"I thought this was one of the highest-level matches I played, even though it was straight sets. No game was really easy to win, I felt, for either player.

"Andrea was playing an amazing match, and she was hitting a lot of winners and put a lot of pressure on me to put the ball deep. I guess I was fighting for every point, because you never know what happens.

"Maybe after these [earlier] matches, they boosted my confidence a lot. It kind of showed I can play at this top level, and hang with these top players."

Gauff, who enjoyed her first career top-10 win against Kiki Bertens in the quarter-finals in Austria, will move into the top 100 of the WTA rankings when they are updated on Monday.

Teenage sensation Coco Gauff will face Jelena Ostapenko in her first WTA Tour singles final after beating Andrea Petkovic in straight sets at the Linz Open. 

Gauff needed a lucky loser spot to take her place in the main draw after failing to qualify but could claim the title on Sunday following a 6-4 6-4 defeat of Petkovic. 

The 15-year-old American saved nine of 10 break points she faced and rallied from 2-0 down to win the first set before claiming the only break of the second to oust German Petkovic on Saturday. 

Gauff showed great defence and mixed up her game impressively, making Petkovic pay for a double fault which gave the teenager a 3-2 advantage in the second set. 

The Florida native, set to move into the top 100 in the rankings on Monday, won 71 per cent of points on her second serve and broke new ground when she put away a textbook volley. 

Ostapenko saved three match points in a battling 1-6 7-6 (7-5) 7-5 defeat of Ekaterina Alexandrova. 

The 2017 French Open champion showed her fighting spirit to reach a first singles final of the year after fending off a match point in the second set and another two in the decider. 

Coco Gauff made the most of a second chance at the Linz Open, while Belinda Bencic suffered a surprise defeat on Tuesday.

Teenage sensation Gauff was defeated by Tamara Korpatsch in qualifying on Monday but entered the main draw as a lucky loser when sixth seed Maria Sakkari withdrew with a right wrist injury.

The American 15-year-old, playing her first WTA Tour event since losing to Naomi Osaka at the US Open, defeated Stefanie Voegele 6-3 7-6 (7-3) in two hours and two minutes to set up a meeting with Kateryna Kozlova in the second round.

Speaking about her last-minute entry into the main draw, Gauff told a news conference: "It was very surprising because I was supposed to do a press thing today. I had practiced earlier, went back to the hotel, and then got a phone call, and was back on court 40 minutes later.

"I didn't know too much about my opponent; I found out a little how she plays through word of mouth, but most of it was me improvising.

"This is my first WTA win indoors. I live in Florida, so we don't get a chance to play indoors that much, but I enjoy it."

Second seed Bencic lost in three sets to qualifier Anna-Lena Friedsam, but Donna Vekic – seeded fourth – cruised past Polona Hercog 6-1 6-1.

Barbora Strycova lost 6-4 6-4 to Alize Cornet, while Julia Goerges and Kristina Mladenovic were among the other victors.

Andrea Petkovic cruised into the second round of the Linz Open with a crushing defeat of Jil Teichmann and Coco Gauff failed to qualify on Monday.

Petkovic has twice reached the semi-finals of the tournament in Austria and moved into round two with a 6-1 6-1 thrashing of Teichmann.

The experienced German knocked Teichmann out in the first round of the China Open last week and took just 68 minutes to send the Swiss packing once again.

Teenage prodigy Gauff will not feature in the main draw after she was beaten 6-4 6-2 by Petkovic's compatriot Tamara Korpatsch in qualifying.

Viktoria Kuzmova eased to a 6-4 6-2 victory over Julia Grabher, while Anna Blinkova fell to a 6-1 6-7 (1-7) 7-6 (7-5) first-round defeat to Kateryna Kozlova on day one.

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