Sandhu, who came through two rounds of the qualifiers in the PSA event to enter the main draw, showed greater application and skill to topple his higher ranked Malaysian rival 4-11 11-6 11-2 11-2 in 51 minutes at the Cricket Club of India.
In another surprise, wild card Ramit Tandon of India shunted out the number 8 seed Abdulla Mohd al Tamimi of Qatar 11-7 4-11 11-4 11-3 in 45 minutes to join compatriot Sandhu in the quarters.
But he took control of the match from there on by running up big leads early in each of the next three games. He led 6-1 in all these games and did not allow Yuen to fight his way back.
In fact the Malaysian, who was penalised on quite a few occasions for coming in the Indian's way, seemed to throw in the towel once the lead became too big in all the games.
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Sandhu hit fluently on both flanks, was the faster of the two and took the ball early. He also played some excellent drop shots to fox his rival.
4-11, 11-6, 11-2, 11-3; Joel Makin (WAL) beat [6] Chris Simpson (ENG) 11-8, 8-11, 11-6, 8-11, 11-7; [Q] Mazen Gamal (EGY) beat [4] Omar Abdel Meguid (EGY) 4-11, 11-7, 11-3, 8-4 (retired); [5] Nicolas Muller (SUI) beat [Q] Ammar Altamimi (KUW) 11-7, 8-11, 11-5, 11-7;
[WC] Ramit Tandon (IND) beat [8] Abdulla Mohd al Tamimi (QAT) 11-7, 4-11, 11-4, 11-3.
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