19 of Daniil Medvedev's 21 titles have been achieved on hard courts
A comeback Medvedev won his first title for 882 days with victory over opponent Moutet in the competition final.
Medvedev, a ex- number one, has had a torrid season, winning just one match at the big events and suffering a difficult moment at the American major.
The player's unpredictability on the ATP Tour - and issues with his serve in specific - led to him exiting of the elite rankings and finally separating with long-time mentor Gilles Cervara.
Now working with Johansson and his other coach, the tennis star has steadily advanced in the recent weeks - peaking in a hard-fought three-set triumph over challenger Moutet.
This represents his maiden trophy since the Rome competition and initial on a hard surface from spring of 2023.
Victory also means the Russian has won 21 victories at twenty-one distinct events.
"This marks the first occasion I have attended a competition with my both daughters simultaneously, so to win a championship is particularly special," stated world number 14 the champion.
"This championship is in dedication of my second daughter Victoria, because the first title I got when my first daughter Alisa was born was for her."
The athlete, the 2021 US Open champion, had lost his previous six championship matches, featuring in Halle previously this season.
His counter-punching approach and frequent reactions on court had led observers to question if his skill to compete at the elite level was concluded.
Yet the 29-year-old has made changes in recent weeks, attempting to come to the net and perform assertively, reinforced by an better serving game.
He recovered from a deficit in the opening set against the challenging Frenchman, taking 4 of the last five exchanges to take the lead.
The pair traded break points in the second set before the challenger, attempting for his initial professional championship, gained dominance to force a final set.
Moutet defended four early-game break points in a tight deciding set before the champion secured a break to 15 to close out the victory.
Suitably, the winner clinched the win with a shot at the front of the court, with his opponent failing to manage a return after two hours and 38 minutes.