Cavanman Michael Finnegan recorded the first major shock of the World Championships at Citywest when he showed tremendous battling qualities to oust No 4 seed Sean Lenning with a career-best performance in the round of 16.
The Seattle man was expected to comfortably book his place in the quarter-finals, but couldn't cope with the Kingscourt right-hander's power serves and aggression, as he became the first big-name casualty of the event.
Meanwhile, it was business as usual for reigning champion Paul Brady, who saw off the the spirited effforts of Cork teenager Killian Carroll in straight games.
Brady trailed 5-0 in the second game, but the Mullahoran dynamo's power and front-court smarts were too much for the talented young player from Mallow.
No 2 seed Robbie McCarthy defeated his Team Ireland doubles partner Brian Carroll in straight games, while two-time world Open Doubles champion Eoin Kennedy showed his class all the way through as the Dubliner comfortably dispatched Pittsburgh left-hander David Fink.