Among the injured is Saksham Yadav, who bagged the gold medal for India at the World Weightlifting Championships in 2017.
The mishap took place at around 4 am when the sportsmen were returning to Delhi in their Maruti Suzuki Swift DZire vehicle after attending an athletic meet in Panipat.
The death toll in the Sunday morning road accident near Delhi-Haryana border involving six national-level weightlifters climbed to five after one of the two seriously injured sportsmen died at the AIIMS here.
Police officials suspect that despite the foggy conditions, the driver had been speeding and couldn't notice and avoid the divider.
According to the police, the vehicle first hit a divider and then crashed into an electricity pole. While another person identified as Rohit (23) suffered minor injuries and is still recuperating at the hospital.
The accident took place at around 4 a.m. near Alipur village, close to Delhi's Singhu border with Haryana.
Police said that they were driving towards Karnal in Haryana after the birthday celebrations of one of the occupants of the auto.
Police are also probing the angle of drunken driving.
The impact of the accident was so high that the car's roof was completely blown off, police said.
The injured are undergoing treatment.
Powerlifting world champion Saksham Yadav and another player identified as Bali have been admitted to Max Hospital in north-west Delhi's Shalimar Bagh. The deaths have come as huge blow to the families of the deceased.