Simon wins all-French battle
Gilles Simon ended the hopes of fellow Frenchman Gael Monfils at the quarter-final stage of the Thailand Open in Bangkok.
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Simon, winner of this event in 2009, triumphed 6-4 6-1 in 86 minutes, breaking serve five times in all.
After making a slow start, the world No 19 wrapped up the victory by winning 12 of the last 15 games.
Simon, who split amicably this week with long-time coach Thierry Tulasne, said: "Gael tries everything to win but I was strong enough to beat him.
"It was tough but I played him the right way."
Monfils, who recently returned to action after four months out with a knee injury, added: "I was tired and it was a tough match. I was also a bit worried about my knee.
"It's always difficult to play Gilles, we know each other's games so well.
"I tried to play a different game against him, trick him a bit. But in the end it didn't work."
Simon will play top seed Janko Tipsarevic in the last four after the Serb saw off Fernando Verdasco 7-6 (7/5) 6-4.
The other semi-final will see Richard Gasquet take on Jarkko Nieminen.
Second seed Gasquet beat Australia's rising star Bernard Tomic 7-6 (7/5) 6-4, while Nieminen upset third seed Milos Raonic with a 6-3 7-6 (7/3) victory.