World champion boxer M C Mary Kom was a relieved mother after as her ailing son underwent "successful" heart surgery in Chandigarh on Wednesday.

- ' I was born to do boxing only'

Mary, who won the gold medal in the Asian Cup women's boxing tournament in China on Monday, had to rush to Chandigarh as soon as she landed in Delhi on Tuesday night to be with her son.

Her three-and-a-half-year old son K Khupneivar, who is suffering from congenital heart disease, underwent cardiovascular surgery at the Postgraduate Institute of Medical Education and Research in Chandigarh.

Mary's husband Onler, who was with the son, said the surgery went off without problem.

"The surgery is over now without any problem. My son is still in the ICU, as is required after any operation," Onler said.

"Mary is relieved that the surgery is over without problem. I was looking after Khupneivar when she was in China. She is now with our son," he said.

Onler said it was a tough decision for Mary to participate in the Asian Cup.

"It was a very difficult decision for Mary to go to China for the Asian Cup, but we wanted her to take part in the tournament. My son was very happy when he knew that his mother won a gold," he said.

"We have a Manipuri friend who is a heart doctor here at PGI. So we decided to do the surgery here. Mary had to rush directly to the hospital from Delhi airport. Now everything has turned out for the best. She has won gold and the surgery is over without problem," he added.

The 28-year-old Mary, a mother of two, defeated her North Korea opponent Kim Myong Sim 4-3 in the final of the 48-kg category to win the gold medal.

Besides winning five consecutive World titles, Mary has four Asian Championship gold medals and 11 national titles under her belt. She is an Arjuna Awardee and also won the Padma Shri and Rajiv Gandhi Khel Ratna.

She won a bronze medal in the 2010 Asian Games in China.