NEW DELHI, March 30 -- A frustrated PV Sindhu suffered a quarter-final exit at the $210,000 Spain Masters after she went down fighting in three games at the Centro Deportivo Municipal Gallur in Madrid on Friday.

The former world champion was down five match points (15-20) in the decider before staging a brilliant fightback to level the contest at 20-all. But a couple of errors from Sindhu let Thai sixth seed Supanida Katethong win 24-26, 21-17, 22-20 in a marathon contest that lasted an hour and 17 minutes.

Frustrated at not having pulled it off, second seed Sindhu smashed her racquet on the court, perhaps for the first time in her career, to earn a yellow card from the chair umpire.

Effectively the top seed after local girl Carolina Mar...