Italy's Matteo Berrettini overcame second seed Roberto Bautista Agut 7-6(9), 6-4 to win his first title at the Swiss Open in Gstaad on Sunday.
World number 17 Bautista Agut, who was playing in his first event since he suffered a hip injury in Halle, gave everything to stay in contention after fending off five break points but failed to match his opponent's powerful groundstrokes.
The 22-year-old Berrettini snatched the opening set tiebreak 11-9, before converting a break point in the 10th game of the second to wrap up the victory.
"From the beginning until the end it was really tough to break him," Berrettini said. "I served really good most of the days and it was an unbelievable tiebreak."
"If I lost the tiebreak, I think the match would have been really tough. I was lucky I did a really good job."
Playing in his first tour level final, Berrettini produced a fearless display, firing 17 aces and losing 12 points on serve in total. He finished the tournament without dropping a set, ousting 2016 champion Feliciano Lopez and fourth seed Andrey Rublev on his way to lifting the title.
Lucky loser Danilovic claims maiden title in Moscow
Serbian teenager Olga Danilovic became the first player born in 2000s to win a WTA title, defeating fellow 17-year-old Anastasia Potapova 7-5, 6-7(1), 6-4 in the Moscow River Cup final on Sunday.
Having squandered an opportunity to close out the match in the second set, Danilovic was forced to recover from a break down in the decider as she became the first lucky loser to win a WTA title.
World number 187 Danilovic is also the youngest title winner at tour level since Ana Konjuh's triumph at Nottingham in 2015.
The left-handed Danilovic, who was granted a place in the main draw despite losing the final round of qualifying, demonstrated an impressive commitment to all-out aggression in her first career final, with 49 winners and 46 unforced errors.
Russian wildcard Potapova, who had won both the previous singles encounters with Danilovic at junior level, fought hard to stay in the contest but was undone by 32 unforced errors as opposed to only 18 winners.
Isner reaches eighth Atlanta final, will face Harrison
Top seed John Isner reached the Atlanta Open final for the eighth time on Saturday after beating Australian Matthew Ebden 6-4, 6-7(6), 6-1 in their semi-final.
The win, achieved in just under two hours in Georgia's sizzling afternoon heat, was a small measure of revenge for Isner, who lost to the same opponent in the first round of the Australian Open in January.
Isner will meet fellow American Ryan Harrison in Sunday's final after the eighth seed prevailed over Britain's Cameron Norrie 2-6, 6-3, 6-2 in less oppressive evening conditions.
Isner served 26 aces against Ebden, who appeared to be hindered by a sore neck and served 15 double-faults.
Wang lifts first WTA title in Nanchang after Zheng retirement
China's second seed Wang Qiang claimed her first WTA title after her compatriot Zheng Saisai was forced to retire injured trailing 7-5, 4-0 in the Jiangxi Open final on Sunday.
Wang struggled to find her rhythm in the opening exchanges, allowing Zheng to seize her opportunities by mixing up baseline drives and deft drop shots.
But the match turned, with Zheng leading 5-3 and two points away from clinching the opening set, when Wang backed her incredible defensive skills to respond with a break and draw level at 5-5.
The 26-year-old Wang found another gear as she roared through eight of the last 10 points to close out the set in splendid fashion.
Zheng, who was out injured from last September to this March, complained to her coach of fatigue at the end of first set and looked to shorten points with angled drop shots.
But Wang was up for the task with crisp volleys at the net to convert consecutive breaks of serve before Zheng, in tears, conceded the match and title to her compatriot.
Wang became the eighth Chinese champion in WTA history, and a third consecutive winner in Nanchang from the home nation after Duan Yingying and Peng Shuai.