Former finalist Thiem out of French Open qualifiers
He was visibly moved as he spoke fondly of his connection with the French clay.
"Thank you for this marvellous goodbye," the Austrian said as he received his trophy.
"I have had so many good results, good memories and good moments on these courts, I'll never forget it," he said.
Thiem has failed to go past the first round of the main draw in Paris since his 2019 run to the final and has dropped from World No.3 to 131 in the rankings.
His career has been blighted by a niggling wrist injury and since his crowning moment in 2020 when he beat Alexander Zverev in the Covid-affected US Open final his career has nose-dived.
The 30-year-old has already announced plans to retire from tennis at the end of the 2024 season.
The first round of the French Open proper begins on Sunday.
