Australian teenager Lleyton Hewitt showed why he is being regarded as one of the dark horses for this week's CMG Asia Open with a polished straight-sets defeat of Lee Hyung-taik at Victoria Park last night. Hewitt, who became the second youngest winner of an ATP Tour event when he triumphed at his hometown event, the Adelaide Open, in January, turned on the power to cruise past the South Korean 6-2, 6-4 into the quarter-finals. The 17-year-old's service game was the key to the win, and although Lee rallied hard in the second set, Hewitt always had plenty in reserve. 'I'm pretty happy with my service game. I guess that was the key to it - I seem to have got a good rhythm going at the moment,' the eighth-seeded player said. Hewitt is still adjusting to life on the tour, especially after the tumultuous singles title win in Adelaide which featured wins over Scott Draper, Mark Woodforde, Jason Stoltenberg, Vincent Spadea and Andre Agassi. 'That changed a lot for me. Before that I was a total unknown. Being in places like Sydney and Melbourne and having people come up to you for autographs takes a bit of getting used to,' Hewitt added. The talented right-hander has now set his sights on a regular place in the world's top 100. 'That's the target for me at the moment. I'm not going to put a time frame on it but that's what I want to do and after that I want to get in the top 50,' Hewitt said. In other singles games at Victoria Park, American Justin Gimelstob finished his rain-delayed first-round match against South Korean Yoon Yong-il in 18 minutes. Gimelstob, who had taken the first set 6-3 on Tuesday, blasted his opponent off the court to win the second 6-2. Elsewhere yesterday, Hong Kong's interest in the tournament ended with Melvin Tong and Wayne Wong making an early exit from the doubles tournament. The Hong Kong duo were soon in trouble against the Czech Republic's Petr Kralert and Thailand's Paradorn Srichipan, losing the opener 6-3. They came back well in the second to level the match with a 6-2 win but were unable to sustain their momentum into the decider, eventually losing 3-6, 6-2, 2-6. 'They just had too much power,' said Tong after the defeat. 'We tried to slow the game down in the second set and it worked. But in the final set they raised their game.'