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 on Thursday. (Agencies)
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.
The 59-minute battle saw World No 37 Pawar riding on his clear winners to tackle Kuncoro, who had won the silver and bronze medals at the World Championship in 2007 and 2009 respectively.
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.
Among others, Ajay Jayaram prevailed over Chinese Taipei's Tien Chen Chou 21-11 21 18 in another men's singles match but Sourabh Verma and Sai Praneeth B failed to cross the first hurdle.
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.
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 on Thursday.