The 23-year-old rolled in five birdies, including three in his final four holes, on another steamy day at Kasumigaseki Country Club, finishing second at nine-under 133 with the Danish pair of Nanna Koertz Madsen (64) But it was. and Emily Christine Pedersen (63).
Aditi, playing her second Olympics with her mother Maheshwari, is four shots behind world No. 1 Nelly Korda of the USA.
Korda (67-62) was 11-under after 17 holes and was ready for a historic sub-60 score of 59 on the par-71 course. Diksha Dagar, the other Indian in the field, scored 72 runs in six overs to finish 53rd at 148.
Aditi made birdies on hole number 2, 5, 15, 17 and 18.
"In the last three holes, I had a few shots which were just a good number for me and I really didn't have any short approaches throughout the day, maybe just a couple," Aditi said.
"There will be a lot of girls birding this week, especially because the weather is warm and the conditions are favorable," he said.
"I think whatever holes I get to play, whether it's 54 or 72, I'm not really going to sit on anything, I'm just going to try and get aggressive and make more birdies."
Asked if she thinks she can win a medal, Aditi, who finished 41st in Rio five years ago, said, "Oh yeah, definitely.
"It's like everyone's thinking about it. It's definitely in the back of my mind. But of course, I'm not really thinking about it much. I'm just trying to hit the best shot." Whom I can hit.
"And hopefully people back home are seeing more of it. I know some of my friends are ready to watch, which is good. The Olympics is huge.
"People won't follow it as much on a regular schedule, whether it's an LPGA event or a major. So, yeah, I think the buzz has been good so far."