Top seed Janko Tipsarevic of Serbia prolonged his run at the Bangkok Open series to 7-0 after he beat Sadio Doumbia of France 6-3 6-1 in the second round of the US$50,000 Bangkok Open Challenger 2 at Rama Gardens Hotel on Wednesday.

Former world No 8 Janko Tipsarevic of Serbia produced a superb all court coverage to hand two-time champion Blaz Kavcic of Slovenia his first loss in the capital during the rained interrupted final match of the US$50,000 Bangkok Open Challenger 1 at Rama Gardens on Sunday.