Megastar Amitabh Bachchan and superstar Shah Rukh Khan have congratulated India's Olympic 2016 silver medallist P.V. Sindhu, who defeated Spanish top seed Carolina Marin in the final of the India Open World Superseries badminton championship.

Big B on Sunday night tweeted: "P.V. Sindhu wins India SS title. Huge congratulations! Sweet revenge, after the Olympic loss but this one more convincing!"

Shah Rukh Khan, who is currently busy filming filmmaker Imtiaz Ali's film, which is tentatively titled "The Ring", thanked Sindhu for making the country proud.

"Super performance by P.V. Sindhu. Congratulations and thanks for making us proud," SRK wrote.

Sindhu overcame her Rio Games conqueror Carolina Marin of Spain in straight games to win her maiden India Open Superseries badminton title at a packed Siri Fort Sports Complex, in New Delhi on Sunday.

The match-up between Sindhu and Marin was a repeat of the 2016 Rio Olympic final which saw the Spaniard taking away the gold medal in a hard-fought encounter.

But in front of her home fans here, third seed Sindhu posted a 21-19, 21-16 triumph in 46 minutes to give another display of her fast-rising career.