What spurs this Indian boxer to triumph at Rio Olympics...

- 'London taught me a big lesson.'

- 'I have an unfinished business in the Olympics. My dreams were shattered in London. I want to fulfill them in Rio.'

Vikas Krishan Yadav has learned from the bitterest experience that he can leave nothing to chance in the Olympic ring and it is a lesson the Indian boxer will carry with him to the Rio Games.

Four years ago, the then 20-year-old welterweight thought he had clinched a place in the quarter-finals of the London Olympic tournament after beating American Errol Spence 13-11.

His joy turned quickly to outrage when amateur boxing's governing body AIBA, after reviewing video footage, overturned the result and awarded the American four additional points for fouls committed by Yadav.

India subsequently took the case to the Court of Arbitration for Sport (CAS), which rejected the appeal.

Yadav has since moved up to the 75kg category, but the feeling of being wronged in London has never left him.

"London taught me a big lesson," the softly-spoken boxer told Reuters in an interview, sporting a mosaic of bruises on the top half of his face and a couple of stitches over his righteye.

"It taught me I can't leave anything to chance. It taught me results of close contests can go either way even after you've been declared the winner."

"Since then, I have always tried to make my bouts one-sided and win it really big. That will be my effort in Rio as well."

Shattered by the London setback, Yadav largely shunned the ring for the next 18 months, undertaking training to become a policeman in Haryana instead.

"I was a lot younger and more vulnerable then. I saw no point in continuing boxing. I would wake up at nine, sleep late and be casual about my training," he recalled.

"But a boxer is like a caged bird which doesn't know what to do with freedom. I started craving the rigour of boxing."

"The time away from ring allowed me to think about boxing. Now I'm better prepared to deal with any such heartbreak."

He is, though, determined to ensure he does not have to deal with anything similar in Rio.

"I have an unfinished business in the Olympics," he said. "My dreams were shattered in London. I want to fulfill them in Rio."

ON COMPETITION MODE

Yadav secured his Rio spot only at the end of last month at an Olympic qualifier in Baku, where he settled for bronze after a cut he sustained rendered him medically unfit for his semi-final bout.

"I qualified for London eight months before the Games and probably got a bit too casual," said the boxer who is supported, among others, by JSW Sports.

"This time I could not qualify from (last year's) world championship, so the pressure was building. It helps in a way, for I'm now in competition mode and I'm not going to relax."

For Yadav, who claimed the lightweight gold at the 2010 Asian Games and the middleweight bronze in the next edition ofthe continental gathering in Incheon, winning is all.

He feels embarrassed when all he has to show from one of histrips abroad is a souvenir T-shirt or a bag full of duty-free.

To avoid any such embarrassment after Rio, Yadav is approaching the Games as if they were his last as he bids to emulate Vijender Singh, who won India's first boxing medal witha bronze, also in the 75kg class, at the 2008 Beijing Olympics.

"I'm taking it as my last attempt at an Olympic medal and I feel I'm better prepared this time," Yadav added.

"In London, I was just another clueless young boxer in his first Olympics. Four years down the line and I'm still young but I have Olympic experience behind me too."

"My health is perfect, I got enough ring experience and my coaches and my family are right behind me. If I can't win a medal this time, I probably won't ever."