Tursunov rallied after winning just one game in the second set.
"In the second set he had a lot of chances to attack my second serve, and he was successful in doing that,'' the fifth-seeded Tursunov said. "As I was two breaks down, Paul-Henri was playing with a lot of confidence.
"I can't say that I was better than him. He could have broken me as well in the third set.''
Mathieu said he couldn't accomplish much in the last set.
"He broke me and I couldn't break him, which cost me the match,'' the Frenchman said. "It's tough to lose a match like that. I think that I have to improve two or three things.''
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