The men's 4x400m relay quartet of Kunhu Muhammed, Muhammed Anas, Ayyasamy Dharun and Arokia Rajiv (running as India A) smashed the national record by finishing the race with a timing of 3:00.91secs at Sree Kanteerava Stadium here.
The quartet clipped more than one second from their four-week old earlier national record of 3:02.17secs which they clocked at Erzurum, Turkey.
The men's 4x400m relay team today leaped to 13th spot in the current world rankings from last night's 18th. The top 16 countries in the world at the deadline of July 11 will qualify for Rio Olympics.
The women's 4x400m relay team, which yesterday slipped to 14th spot due to the ongoing European championships in Amsterdam, today bounced back to its original 12th place after this performance.
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Athletics Federation of India Secretary C K Valson said that both the men's and women's 4x400m relay teams are certain to qualify for Rio Olympics.
"The women's and men's 4x400m relay team have virtually qualified for Rio Olympics. The women's and men's relay teams, are now placed 12th and 13th position," Valson told PTI here.
With the addition of the men's and women's 4x400m relay teams, the Indian track and field contingent is likely to swell to 33 as 24 have already qualified for the Rio Games.
Muhammad Anas (men's 400m) and Nirmala Sheoran (women's 400m) and Tintu Luka (women's 800m) have already qualified for the Olympics in their individual events and since they are expected to be in the relay teams, another nine will be part of the two relay squads of six each.
Today's results meant that Athletics Federation of India's idea to provide another chance to its athletes with Olympic ambitions paid off well. The 3rd and 4th (to be held tomorrow) Indian Grand Prix events were hurriedly decided to be held here with this idea.
Mohammad Kunhi, the men's 4x400m relay team coach, said his boys did really good to virtually qualify for Rio.
"I had the target of 3:01.31s, but the boys did extremely well to clock 3:00.91s. I am very happy that the boys will make it to Rio Olympics because right now we are placed 13th, which makes us a strong contender for qualifying. Only a miracle performance by other countries' athletes trying to qualify can better our timing and position," Kunhi said.
On whether the team stands a good chance of winning a medal in Rio, Kunhi said, "If my boys are able to clock 2.58.57s, we stand good chance to win a medal. I will work on the aspects of speed endurance."
Asked about other competitions in the run up to the Rio Olympics, Kunhi said he would take his boys to Columbia for training as the climate there is similar to Rio.
Neena, the National Inter-state Championships winner with 6.45m, had also clinched the gold in Thailand Open with another personal best 6.46m less than a week ago.
The men's long jump event witnessed keen contest between Inter-state victor Yugant Shekhar Singh and Muhammed Anees.
Anees opened with 7.78m and Shekhar responded by improving his personal best to 7.76m in the fourth round. Both the jumpers had an identical 7.80m in the fifth round.
once again toppled Rajinder Singh (75.40m) and Vipin Kasana (73.85m) in men's javelin throw with 76.25m.
In other events, Rio qualifier Inderjeet Singh (Oil India) was an easy winner in men's shot put as he tossed the iron ball to 19.85m. That effort was more than a metre ahead of second placed Tejinder Pal Toor (Punjab, 18.66m) and national record-holder Om Prakash Singh Karhana (ONGC, 18.64m).
National record-holder Siddhant Thingalaya failed in his bid to qualify for Rio in 110m hurdles as he hit the third hurdle very hard that cost him dearly in his timing (13.75 secs) in a thin field.
Maldives' Hassan Saaid was the fastest man of the meet as he ran the 100m dash in 10.37secs ahead of Krishna Kumar Rane (Customs, 10.46secs) and national record-holder Amiya Kumar Mallick (Odisha, 10.49secs).
Some of the biggest names in Indian athletics, who also have qualified for Rio, took part in the Grand Prix. Among them were Dutee Chand (women's 100 metres), Ankit Sharma (men's long jump), Tintu Luka (women's 800m), Mohammad Anas (men's 400m) and Srabani Nanda (women's 200m).