This is the first time that an Indian Greco-Roman wrestler has secured an Olympic berth after the 2004 Athens Games, when Mausam Khatri had made the cut.
In fact, in a heavyweight category, this is the first time that an Indian Greco-Roman grappler has ensured a place in the Games.
Hardeep qualified for the Rio Games by virtue of reaching the final. The top two finishers in each weight category here are assured of a berth in the Olympics, to be held later this year.
Hardeep first thrashed Arslan Saparmammedov of Turkmenistan 11-0 during his quarterfinal bout before outplaying Margulan Assembekov of Kazakhstan 11-2 in the semis to advance to the gold-medal round.
In the final, he will take on China's Di Xiao later in the day.
Meanwhile, other Indians in the fray today -- Vinesh Phogat (women's 48kg), Anita (women's 63kg), Somveer (Men's 86kg freestyle), Hitender (men's 125kg freestyle) and Ravinder (Greco-Roman 66kg) -- failed to book an Olympic berth.