The world number eight beat Gilles Simon of France 3-6 7-6 (7-1) 6-1.

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"I'm super happy. I fought really hard for this title," Thiem said. "I'm really happy that I won. It's always something special. It's my tenth title, which is a great number. I have a little 'decima', I think."
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Thiem has eight claycourt titles in his career and is seen as one of the few players capable of denying world number one Rafa Nadal a record-extending 11th title at Roland Garros.
The Austrian snapped Nadal's year-long winning streak of 50 consecutive sets when he beat the Spaniard in the Madrid Open quarter-finals earlier this month.
His tenacity and endurance will serve him well at the claycourt grand slam that begins on Sunday.
Thiem was forced to play twice on Friday, coming through a three-setter in the semi-final against Dusan Lajovic after earlier completing his quarter-final against Guillermo Garcia-Lopez which had been suspended due to fading light the previous day.
The 24-year-old was staring at defeat while down a set and a break but dug deep to prevail in two hours 24 minutes for his 200th tour match victory and his 10th ATP title.
The long hours on court appeared to tell as Thiem tamely capitulated the first set on Saturday but he found a way back into the match and did not look back.
Thiem, twice a semi-finalist at the French Open, will have a day's break before he begins his campaign at Roland Garros with a first-round match against unseeded Belarussian Ilya Ivashka.
"France has a very special place in my heart. I've always played great tennis here and I hope I will always play great tennis here," Thiem added.
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