The Patiala-based shot putter threw 17.96 metres in her second attempt to claim the gold medal, a hat-trick of titles at the National Open after she returned to field in 2013 following a three year hiatus because of the birth of her daughter Jasnoor.
The 25-year-old, who had the previous best of 16.39 at last year's Delhi National Open, said she was confident of breaking the 19m-mark before next year's Olympics so as to give herself some chance at the quadrennial extravaganza.
Having improved her personal best by one and a half metre in one year's time, Manpreet said she can break into 19 metres by Rio next year.
"Getting into 19 metres is not a big deal, it's about translating your performance in the practice into competition. Today morning only I threw 18.60," Manpreet said after she broke Harbans Kaur's earlier record of 17.43 that came in 1997.
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The IAAF entry standard for 2016 Rio Olympics in women's shot put is 17.80m, while the top three in London 2012 threw 20m plus.
"She too worked in DCDW, Patiala, so it's a matter of great pride that we continued to the trend.