Sijsling, Lopez into Thailand Open quarters
Feliciano Lopez of Spain returns the ball to Go Soeda of Japan during the second round of Tennis ATP Thailand Open 2013 tournament in Bangkok on September 25, 2013
While Lopez went through without problems over Japan's Go Soeda, 7-6 (7/5), 6-3, there was plenty of hard work for Sijsling, who beat compatriot Robin Haase for the second time this season as he posted a 6-7 (7/9), 6-4, 7-6 (7/2) second-round win which took two-and-a-quarter hours.
Sijsling, ranked 75th to the 60th of Dutch number one Haase, said: "It went well but it was a very tough match and we both played well. He got a bit defensive and tried to make the points longer, physically it was tough."
"I tried to play attacking tennis and it worked for me. I got to the net more and I think that helped in the end," added the Bangkok debutant.
Top seed Tomas Berdych was opening his campaign in the second round later in the day against Spain's Roberto Bautista Agut. Berdych last competed in Bangkok in 2008, losing a semi-final to Novak Djokovic.
In concluding first-round play at the hard courts of the Impact Arena, Russian fifth seed Mikhail Youzhny struck six aces and saved all three break points in a 6-3, 6-2 defeat of Italian Paolo Lorenzi.
Making his tournament debut, Youzhny will next play Uzbek Denis Istomin, winner over South Korea's Jeong Suk-Young 6-3, 6-0.
Youzhny, 31, is one of 14 over-30 winners on the ATP this season. He now stands 33-20 in 2013. Lu Yen-Hsun of Taiwan moved into the second round after defeating another Russian, Evgeny Donskoy, 6-3, 6-2.
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