Leonardo Mayer became the second lucky loser in two weeks to win an ATP title on Sunday.
Mayer lost in qualifying but went on to become German Open champion in Hamburg by beating namesake Florian Mayer.
Leonardo had fallen in the final round of qualifying last week but the world number 138 earned a reprieve as a lucky loser when Martin Klizan withdrew injured.
After knocking out top seed Albert Ramos-Vinolas in the first round, Leonardo reached the final where he edged a tight three-set battle 6-4 4-6 6-3 against his German namesake Florian.
He needed an hour and 57 minutes to seal victory after hitting a total of 44 winners, 28 off his forehand.
It is the second week running a lucky loser has gone on to win an ATP World Tour title after Russia's Andrey Rublev pulled off the same feat in Umag.
The previous lucky-loser champion had been Rajeev Ram in 2009.
"It's amazing to win in Hamburg again," Leonardo told the ATP's official website.
"It's like home here and I feel very comfortable. I like the city and I always play well here.
"It's something special about this sport. I lost in qualifying and then beat the number one seed Albert Ramos-Vinolas in the first round.
"It also happened last week in Umag with Rublev. Now I took the opportunity."
In the Swiss Open final in Gstaad, Fabio Fognini beat qualifier Yannick Hanfmann 6-4 7-5 to claim the title.
It was the Italian's first ATP title of the season and the fifth of his career.
Afterwards he reflected on the fact that he had lost his first set of the tournament 6-1 to Nobert Gombos before turning things around.
"It was a really tough week for me. I remember my first match was really difficult. I couldn't play. I lost the first set 6-1 in 20 minutes, but in the end I won the match. I said to my team that if I continue playing like that, I'll go home.
"That's the sport. Every day I was feeling better and now I'm here with the title."
The first event of the summer hardcourt season in North America was won by John Isner, who captured the BB&T Atlanta Open title for a fourth time with a straight-sets victory over US compatriot Ryan Harrison.
The second seed, who has reached the final in seven of the eight years of the tournament, secured his 12th ATP World Tour title to climb to 18th in the world rankings and become the top-ranked American player.
Both men held serve as the first set went to a tie-break with Isner coming out on top 8-6.
Harrison broke Isner early in the second set for a 2-0 lead - Isner had held serve in 75 consecutive games before that - but he broke back immediately before the second set went into a tie-break and Isner took advantage of his second championship point to close out a 7-6 (8/6) 7-6 9/7) victory.
Isner said: "It was a battle. I needed every ounce of my energy out there, but I’m so happy to win this tournament again.
"This tournament has meant everything to me. This is always going to be my favourite time of year. I seem to play well in America every single year, so I couldn’t have asked for a better start."
