South Korea, China on course for last 8
Goals from Cho Sung Hwan (24 minutes), Kim Du Hyan (50), Lee Dong Gook (61) and a brace from forward Lee Chon Soo (65 and 86) destroyed Oman as the Koreans, looking to build on their World Cup success dominated the match.
The host nation need just a point from their final group match against Malaysia to clinch a place in the last eight, though their huge goal difference means they should qualify as group winners in the unlikely event of a defeat.
The Koreans were full of running and sharp, incisive football that kept the Omanis on the back foot throughout the match and their crisp finishing ensured they wrapped up the points long before the end.
In the other group A match Malaysia beat the Maldives 3-1 thanks to a hat trick from Muhammad Shukor Adan. With Oman beating Malaysia 1-0 in their first group match, their final game against the Maldives will determine if they have a chance of qualifying as runner-up.
China top group C after coasting to a 3-0 win over Bangladesh with goals from Wang Xinxin (34 minutes), Yu Tao (43) and Gao Ming (87) and now have a good chance of reaching the quarterfinals after a 4-0 win over Turkmenistan in their first match.
The group will be decided when China face India, who beat Bangladesh 3-0 in their first game and Monday gave themselves hope of reaching the last eight with a second-half comeback to beat Turkmenistan 3-1. Bhutia Baichung (8 minutes), Yadav Avishek (56) and Bhutia Baichung (77) got the goals.
Thailand are also in the running for the last eight after their 3-0 victory over Vietnam in group B after a similar scoreline against Yemen last Friday. Narongchai Vachiraban (29 minutes), Issawa Singtong (62) and Kiatisuk Senamuang (83) all found the net Monday.
The United Arab Emirates gave themselves a shot at reaching the quarterfinals with a 2-1 win over Yemen. Al Jenaibi (6 minutes) and Al Abadla (32) scored the goals.
They have four points after the goalless draw with Vietnam in their first group match and will clinch a quarterfinal place if they beat Thailand in their last group game. A point could still see them through as runners-up.
The winners of the six groups plus the two best runners-up qualify for the quarterfinals of the tournament, which is played at under-23 level in line with the Olympic soccer tournament —Reuters
S.Korea 5 Oman 2
Malaysia 3 Maldives 1
China 3 Bangladesh 0
India 3 Turkmenistan 1
Thailand 3 Vietnam 0
UAE 2 Yemen 1