World number two Saina had to play out of her skin against the 14th ranked Fanetri, who posed a huge threat to the Indian before surrendering 17-21 29-27 13-21 in an hour and 14 minutes in a women's singles first round match at the Istora Gelora Bung Karno Stadium here.
The 23-year-old from Hyderabad will take on the winner of the match between Sayaka Takahashi of Japan and Thailand's Porntip Buranaprasertsuk in the prequarterfinals tomorrow.
In the opening game, Fanetri was leading 5-2 initially and it was only from tied 9-9 that Saina could get ahead of the Indonesian even though she was always breathing down her neck.
The 24-year-old Indonesian, egged on by the local crowd, raised her game and engaged in a fierce battle and went into the breather with a slender 11-9 advantage in the second game.
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Saina battled on and turned the tables at 15-15 but even though she was just two points away from pocketing the match, Fanetri clawed back at the right time and eventually roared back into the contest after an intense fight till the end.
In the mixed doubles, world number 29 pair of Tarun Kona and Ashwini Ponnappa prevailed over Praveen Jordan and Vita Marissa, ranked 30, 21-18 14-21 25-23 in a 53-minute engrossing battle.
The Indian pair will face the seventh seeded Polish combo of Robert Mateusiak and Nadiezda Zieba in the prequarterfinals tomorrow.