Bangladesh 400m runner Towhidul Islam went missing from the athletes' village on Monday, and hasn't been heard from since.

One of just 19 Bangladeshi athletes competing here, he speaks little English and has no friends or family in Melbourne.

Police said a team official described his disappearance as "highly unusual."

The 23-year-old from Kishorgonj was last seen on Monday evening in the village dining hall and was reported missing by the Bangladesh team after he failed to sleep in his bed that night.

He told teammates he wanted to watch the men's 100m sprint final at the Melbourne Cricket Ground but it is not known if ever made it.

Islam's vanishing act overshadowed yet another gold medal for Indian sharp shooter Samaresh Jung, who moved closer to winning an unprecedented seven golds when he took his fourth title here to be neck and neck with Aussie swimmer Libby Lenton.

Australian swimmers Ian Thorpe and Susie O'Neill hold the record of six gold medals each at a Commonwealth Games.

Jung won the men's 50m Pistol individual event after relegating current Games record holder Michael Gault of England to second place at the Melbourne International Shooting Club by scoring 650.2 points.

"It was a good day out there because the wind was not as strong as in the past few days," said Jung. "I am enjoying every moment of it."

In the men's 10m Air Rifle, there was an all-Asia podium with India's Gagan Narang taking top honours in a new Games record of 698.9 points, beating the mark set four years ago by Bangladesh's Asif Hossain.

Zhang Jin of Singapore took the silver with 696.9 points ahead of India's Abhinav Bindra.

Bangladesh's Anjan Kumer Singha and Asif Hossain Khan were fourth and fifth with scores of 691.7 and 687.8 respectively.

While the medals were few and far between Tuesday, Malaysia continued its stunning run in the men's field hockey, upsetting South Africa 2-1 in group B while Pakistan outplayed Trinidad 7-1.

Malaysia and Pakistan, with seven points each, clash in their last league match on Wednesday with the winner assured of topping the group and escaping a semi-final clash against Australia.

India and South Africa, who have four points each and play each other on Wednesday, will also fancy their chances of going through as the second team if they win.

Only a draw between Malaysia and Pakistan will push both teams through and leave India and South Africa in the lurch.

While Malaysia turned it on at the hockey, their men missed out on a crack at the lawn bowls pairs medals, falling in the quarter-finals to Scotland to leave the region with no more representatives.

India meanwhile is in with a chance of a medal in the boxing with heavyweight Harpreet Singh beating Navitalai Cagiloaloa of Fiji in the quarter-finals, and now faces Anderson Emmanuel of Barbados.

"I'm hoping for gold," said Singh. "My confidence is high."

But Indian light-heavyweight Ajay Kumar was beaten on points in the quarters by Joshua Makonijo of Kenya.

Again, there was no joy on the track or in the pool.

So far, Asian nations have won 46 medals, including 12 gold. At the last Games in Manchester four years ago, they won 125 with 43 gold.