Bajrang said the result was beyond expectations.
"Honestly, we just wanted to see how her knees behave, if they hold. We did not expect to win. I just told her to give her best," he said.
In the same 62kg category, Rio bronze medallist Sakshi Malik was knocked out by Manisha.
The youngsters, who recently competed and did well at the junior World Championships, outperformed many seniors. As many as five of them booked their slots in the team ahead of the seniors.
Shubham Kaushik first stunned senior national champion Pankaj 8-3 and then beat Railways' Arun 8-4 to win the 57kg trials.
Yash Tushir, who won a bronze in Russia in junior worlds, outclassed veteran Amit Dhankar in 74kg final. Gourav Balian, who had also won a bronze, outwitted Narsingh Pancham Yadav in a fast-paced final.
Anirudh Gulia (125kg), who won a bronze each in junior worlds also qualified. Ravinder Dahiya (61kg), Rohit (65kg), Sushil (70kg), Sandeep Mann (86kg) and Satywart Kadian (97) were other winners.
Among women wrestlers, Anshu Malik was also not her best but still won the place in the 57kg category with wins over Mansi (TSU) and senior pro Lalita (2-0).
"I have an issue with my left elbow, that's why I could not play freely. I gained good experience in Tokyo though I could not do well. It's just a start for me at the senior level, I will get better," she said.
Experienced Sarita Mor (59kg), Divya Kakran (72kg), who was show-caused by WFI for indiscipline, also qualified along with Hanny (50kg), Pooja Jatt (53kg), Bhateri (65kg) and Ritu Malik (68kg).
In Greco Roman style, Sandeep (55kg) Gyanender (60kg), Gaurav Duhan (67kg), Sajan (77kg), Sunil Kumar (87kg), Ravi (97kg) and Naveen Kumar (130kg) booked their berths in the Indian team.
The WFI decided to hold re-trials in four categories -- men's freestyle 92kg, Greco Roman (63kg, 82kg) and women 76kg since only one wrestler showed up in these weight categories.