The Olympic double-medalist even shared a glimpse of her celebration on Instagram.
Paris Olympics Double Medallist Manu Bhaker Spends Quality Time With Her Family on Raksha Bandhan: WATCH
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Frances Tiafoe was left to rue a second US Open semi-final loss in his last three appearances.
This victory marks India's seventh overall medal in the Asian Championships. India play either Chinese Taipei or Japan in the semifinals on Thursday.
It was Sainz's sixth career pole and completed a run of qualifying fourth, third and second in the last three Mexican events.
World Triathlon confirmed the deaths of two athletes on social media and said "our deepest condolences go to their respective family, friends, National Federations and all the triathlon family".