Cash, who was 32 last month, beat the American Steve Campbell but was in trouble when he trailed 3-5 in the final set. The Australian eventually wrapped up a hard-earned 4-6, 6-2, 11-9 victory after a marathon contest which had kept the crowd enthralled for two hours and 20 minutes.
Miles Maclagan, last season's British No 5, played one of his best matches when he defeated the French seed Frederic Fontang 7-6, 6-2. Maclagan is now the only survivor in the event from 10 British players.
Tony Pickard, the former British Davis Cup captain, helped spur 19-year- old Amanda Janes to victory in the opening round of the women's singles.
Janes, the tall, agile daughter of the former Wimbledon finalist Christine Truman, overcame Lilia Osterloh of the United States 6-2, 6-2, needing five match points in the eighth game of the second set as her concentration began to waver.
It was an encouraging win for Janes, ranked 466 in the world against a stylish but often erratic opponent ranked 284 places above her.
Pickard, who had travelled down from his Nottinghamshire home, revealed afterwards that he had been asked by Janes' mother to advise her daughter. "At this stage I like what I see," he said.
Janes' win was one of three for British players in the women's event and followed victories for Louise Latimer, the reigning junior champion, and Karen Cross.Reuse content