Sindhu registered a stunning comeback win against Thailand's Phittayaporn Chaiwan
Sindhu, seeded third, was not at her usual best and trailed her Japanese opponent from the start in both the games.
Sourabh will next face Korea's Heo Kwang Hee for a place in the men's singles final.
Indian badminton stalwarts P V Sindhu and Saina Nehwal suffered contrasting fortunes at the Malaysia Open Super 750 tournament, the former progressing to the second round and the latter bowing out after losing her opener in Kuala Lumpur, Malaysia, on Wednesday.
Satwik and Ashwini, who reached the semi-finals at Toyota Thailand Open Super 1000 in January, will meet the winner of the match between fifth-seeded Malaysians Tan Kian Meng and Lai Pei Jing and Germany's Jones Ralfy Jansen and Kilasu Ostermeyer.
Sourabh kept moving ahead despite a spirited fight from Heo and eventually pocketed the match.
P V Sindhu will be eager to return to the podium as former winner Saina Nehwal looks to regain her touch
Returning to action after nearly two months, Saina, who made last-minute withdrawals from Indonesia Open and last week's Japan Open because of injuries, got past Chaiwan 21-17, 21-19 in her opening round contest.
Former champions P V Sindhu and Kidambi Srikanth progressed to the second round in the Yonex-Sunrise India Open badminton scoring contrasting victories, in Delhi, on Wednesday. Si
World Championships bronze medallist Simranjit Kaur (60kg) and GeeBee Boxing silver medallist Dinesh Dagar (69kg) confirmed their places in the final, while Ankush Dahiya (64kg) and Ananta Pralhad Chopade (52kg) made it to the semi-finals.
Summary of sports events and persons who made news on Friday
A summary of sports events and persons who made news on Thursday