Casper Ruud secured back-to-back titles by beating Hugo Gaston in straight sets to be crowned Swiss Open Gstaad champion on Sunday.

Ruud won the Nordea Open last weekend and added a fourth ATP Tour title of his career with a 6-3 6-2 defeat of Frenchman Gaston.

The Norwegian took his tally of tournament victories on clay this year to three, having also won the Geneva Open in May, and the 22-year-old will rise to ninth spot in the ATP Race To Turin on Monday.

Ruud saved nine of the 10 break points earned by first-time ATP Tour finalist Gaston, who only won 51 per cent of points behind his first serve.

Gaston, who had never been beyond the second round at an ATP Tour event before this week, was broken twice in each set as the 20-year-old was unable to halt Ruud's brilliant run on clay.

Left-hander Gaston broke straight back after Ruud went 3-1 up in the opening set but failed to back that up with a hold.

Ruud had as many as 16 break-point opportunities but got the job done in an hour and 34 minutes.

Hugo Gaston is one win away from securing his maiden ATP Tour title, but he must overcome in-form Casper Ruud at the Swiss Open Gstaad.

Gaston, ranked 155th in the world, booked his place in his first tour-level final with a 3-6 6-3 6-3 victory over Laslo Djere of Serbia on Saturday.

The 20-year-old had never advanced past the second round at an ATP Tour event before this week. He has now won three matches in a row in a third set.

"I tried to take more time with my game," Gaston said. "I made a lot of mistakes in the first set, so I tried to change my game. My serve was better in the second and third set.

"I am really happy to be in the final. It is going to be a good match, but I will try to enjoy [this] moment."

Ruud, meanwhile, enjoyed a rather more straightforward procession in his semi-final, with world number 249 Vit Kopriva little match for the 22-year-old Norwegian.

The world number 14 needed just 74 minutes to win 6-3 6-0, reaching his second final in as many weeks following his success in Bastad.

Ruud has won 23 clay-court matches already in 2021 and is in the hunt for his fourth career title.

Hugo Gaston showed admirable spirit as the young Frenchman saved four match points in a gripping tie-break against Cristian Garin en route to reaching his first ATP Tour semi-final.

Garin, the fourth seed, responded impressively to going a set down and then got to match point four times in their third-set tie-break, but he could not hold his nerve and Gaston got the job done 6-4 1-6 7-6 (13-11).

The Chilean was on the back foot right from the start Gaston broke him in the first game, and although Garin did hit back to make it 3-3, his opponent quickly had the advantage again and went on to seal the first set.

Garin's response was emphatic and clinical, dropping just three points on his serve and taking both of the break points that came his way to level the match.

The pair could not be separated in a back-and-forth third set, but Garin was the first to get match point at 6-5 in the tie-break – they would trade another six equally between them before Gaston finally prevailed at 13-11, leaving the 20-year-old satisfied.

"I am very happy to be in my first [ATP Tour] semi-final," Gaston said after.

"It was a great fight. It was a really long match. I always tried to play my game, and it is a good win for me. I hope I can continue like that."

Up next for Gaston will be Laslo Djere after he saw off Arthur Rinderknech 6-4 6-7 (5-7) 6-4, while Casper Ruud – the highest seed remaining – is also into the final four.

The Norwegian was victorious at the Swedish Open last week, his second title of the year, and dispatched Benoit Paire on Friday to reach another semi.

Ruud won 6-2 5-7 6-3 in just under two hours and will face Vit Kopriva, a qualifier, who secured his first semi-final appearance thanks to a stunning 6-1 6-0 win over Mikael Ymer.

At the Croatia Open in Umag, top seed Albert Ramos-Vinolas cruised into the last four with a straightforward 6-2 6-1 defeat of Stefano Travaglia, setting up a meeting with either Filip Krajinovic or Carlos Alcaraz.

The other semi will be contested between Richard Gasquet and Daniel Altmaier, who produced something of a shock by ousting second seed Dusan Lajovic 6-2 6-4.

The veteran Frenchman came through against Damir Dzumhur 6-3 7-6 (9-7), clinching the second set at the fourth opportunity.

Top seed Denis Shapovalov's Swiss Open Gstaad campaign came to an abrupt end as Vit Kopriva provided a second-round shock to eliminate the Wimbledon semi-finalist.

The world number 10, who has recently been praised by both Roger Federer and Rafael Nadal, took the first set 6-2 with ease before Kopriva, making his ATP Tour debut this week, emphatically fought back 6-3 6-2 to secure a memorable comeback victory.

Number three seed Casper Ruud battled past Dennis Novak 6-4 7-6 (7-5), while Benoit Paire, who only had two ATP wins in 2021 before the Hamburg European Open last week, was 6-4 to the good before Tallon Griekspoor was forced to retire due to injury.

Ruud, who has already won two ATP events in 2021 and three in his career, will now meet sixth seed Paire in the quarter-final stage.

But eighth seed Feliciano Lopez did not enjoy similar success as the world number 96 Mikael Ymer fought past the Spaniard to win 6-7 (6-8) 7-6 (9-7) 6-4 and set-up a quarter-final clash with Kopriva.

At the Umag Open in Croatia, third seed Filip Krajinovic breezed past Radu Albot to record a 6-4 6-2 win.

Krajinovic's countryman and number two ranked player Dusan Lajovic also went through with a 7-5 6-4 win against Bernabe Zapata Miralles.

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