Sindhu, seeded eighth, brushed aside local shuttler Yukino Nakai 21-12 21-13 in less than half an hour to set up a clash with another Japanese qualifier Akane Yamaguchi in the women's singles second round tomorrow.
However, it was Pawar who first hogged the limelight when he scripted a 21-17 7-21 21-18 victory over world number 12 Indonesian Sony Dwi Kuncoro, also a 2004 Athens Olympics bronze medallist.
Thailand Grand Prix Gold winner Srikanth, who had been in rollicking form at the Indian Badminton league, also continued his giant-killing act at the Japan Open when he eked out a hard-fought 22-20 22-24 21-18 over world number 22 Sho Sasaki of Japan in a hour and eight minute match.
Srikanth rode on his powerful smashes and also gave Sho a good fight at the nets to carve out the victory, which helped him set up a face-off with second seed and world number two Chen Long of China.
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While Jun Takemura of Japan spoilt Sourabh's campaign with a difficult 22-24 21-19 21-14 win, Sai Praneeth fight against eighth seed Yun Hu of Hong Kong ended with a disappointing 21-23 18-21 loss for the Indian.
It was also the end of road for Tanvi Lad as she went down 15-21 10-21 to Sayaka Takahashi of Japan in the opening match.
India's men's doubles pair of Manu Attri and Sumeeth Reddy B, however, entered the second round with a 21-17 21-15 win over local combo of Hiroyuki Saeki and Ryota Taohata in the opening round match.