Kokkinakis is determined to cash in after his convincing victory at the US Open

Thanasi Kokkinakis hopes his turbo-charged US Open triumph over Stefanos Tsitsipas will be the spark that finally gets his faltering career back on track. The hapless South Australian rightly described his 7-6 (7-5), 4-6, 6-3, 7-5 victory over the 11th…