KUALA LUMPUR (AFP) China and India were in cruise-control as they eased into the Thomas Cup quarter-finals Tuesday while Indonesia and Japan booked their places in the knockout stage of the Uber Cup. The unstoppable Chinese stormed past fifth seeds South Korea while India saw off Australia and Indonesias women barely broke sweat against Denmark to progress with an impressive Japan. Lin Dan, the world and Olympic champion, got the ball rolling for China, carving out a gripping 21-18, 25-23 victory over Park Sung Hwang, with Chen Jin and Bao Chunlai also winning. Park is the number one player in South Korea and it was a good opportunity for me to compete with him, Lin said. In the second set he was 17-12 up and I wasnt focused on the game. Park was playing better and it was difficult for me, but if Id lost it would have been okay because I was prepared for a third set. World number 13 Park voiced his frustration over losing a second set which was within his grasp on several occasions. Early in the second game Lin Dan played really fast and had a strong attack. I couldnt catch up with that. After the interval I tried to focus and matched his speed and followed his game, and because of that I just cut off at the end. I was really disappointed. Yoo Yeon Seong/Ko Sung Hyun, making their Thomas Cup debuts, provided little reason for cheer, beating Chinas Guo Zhendong/Chen Xu in the closest match of the tournament so far, as Korea were defeated 4-1. Indian doubles pairing Sanave Thomas and Rupesh Kumar slipped to an unexpected defeat against Australias Glenn Warfe/Ross Smith but India were already assured top spot in their group and ended the tie 4-1 winners. Kayshap Parupalli built on a promising first day performance, beating Jeff Tho 21-8, 21-10, while Arvind Bhatt and RMV Gurusaidutt were equally impressive, winning comfortably to make the doubles matches irrelevant. In womens Uber Cup action, Indonesia finished top of Group B with an emphatic 5-0 win over Denmark, who also qualify, while Japan defeated Russia by the same score in the decider for number one spot in Group C. Indonesian doubles specialist Greysia Polii teamed up with Nitya Krishinda Maheswari to see off impressive Danish pairing Kamilla Rytter Juhl/Christinna Pedersen (DEN) 13-21, 21-15, 12-13. It was the only set dropped by Indonesia all day and Polii signalled the fourth seeds intent with a warning to their rivals. We bring from Indonesia a mood of happiness, solidarity and togetherness so were not afraid of any of the other teams, whether its China or Korea or anyone, she told AFP. I dont care how they play or what they do. It just a matter of who is ready in the court. If Im ready then I will be a winner. Malaysia take on Japan in the Thomas Cup later Tuesday and tournament favourites China in the Uber Cup, with the host nations men and women aiming to top their groups. Sony back after injury Indonesias Sony Dwi Kuncoro came through an injury that threatened to end his Thomas Cup participation to complete a two-hour training session on Tuesday, his team said. The second seeds had been preparing to replace their number two player for the remaining fixtures in the team world championships after he retired with a hurt back in his rubber against Indias Arvind Bhatt on Monday. But team manager Yakob Rusdianto said: Sony woke up this morning feeling fine and went with the rest of the team for training. He did not show any signs of being disturbed by his back injury. This is certainly good news for us. Still, we are not going to rush into things. The team doctor will take another look at the player and see the progress. Later tonight we will sit down and discuss Sonys case before deciding on the team for tomorrows quarter-finals. Indonesia won their Group D tie against India 4-1 but Kuncoro sent shockwaves through the Indonesian camp when he quit after 32 minutes while trailing 9-15 in the second set. Yakob said the shuttlers back problem was an old injury which had been affecting him on and off court. He suffered a recurrence at this years All England but he recovered well to vie for a place in the Thomas Cup team, he added. Twelve countries are competing for the biennial Thomas Cup, which started on Sunday, with China defending their title. Indonesia is the tournaments most successful team, having won 13 times. They were last crowned champions eight years ago in Guangzhou, China. The Uber Cup, the womens equivalent, is played concurrently, with China also the team to beat.