Ankita came from behind to beat the Italian 5-7, 6-1, 6-2 in the opening round of the USD 235,238 hardcourt tournament.
Prannoy admitted that hard quarantine at times could be so lonely that one feels that he can no longer go out in the sun.
Thailand Open Super 1000: Sameer Verma, Satwik-Ponnappa sail into quarters; Anthony Ginting ousted in shock defeat
Sameer Verma will next face third seed Anders Antonsen of Denmark, who received a walkover, in the quarter-finals.
Thailand Open Super 1000: HS Prannoy battles pain to upset Jonatan Christie; Ashwini Ponnappa-Sikki Reddy bow out
It is HS Prannoy's first win against the sixth-seeded Indonesian in the last four attempts.
Thailand Open Super 1000: Sai Praneeth out after positive COVID-19 test, roommate Kidambi Srikanth forced to pull out
Kidambi Srikanth had defeated Thailand's Sitthikom Thammasin 21-11 21-11 on Tuesday.
Thailand is hosting three consecutive badminton tournaments in Bangkok culminating in the World Tour Finals from 27 January.
The former world number one Spaniard was an imposing force with razor sharp smash shots, clever net work and an unmatched level of aggression and agility.
Every one of the eight singles exponents – six in the men’s category, and two among the women, comprising the cream of Indian badminton – were sidelined before the completion of the second round matches
Thailand Open: Saina Nehwal, Chirag Shetty-Satwiksairaj Rankireddy eliminated, Kidambi Srikanth pulls out injured
In a battle of attrition, Saina managed to grab the opening game but ran out of steam in the end, losing 23-21, 14-21, 16-21 in a match that clocked 68 minutes. It was Saina's fourth straight loss to the world number 12 Busanan.
The Thailand Open is the first of three consecutive tournaments played in a bio-secure 'bubble' in Bangkok as badminton resumes after a coronavirus-ravaged 2020.
The world body also said that all players who were tested on Tuesday have returned negative.
Thailand Open: Saina Nehwal, Kidambi Srikanth win in straight sets, Carolina Marin through to second round
Saina got the better of Selvaduray Kisona of Malaysia 21-15, 21-15 in the women's singles opening round to set up a clash with Thailand's Busanan Ongbamrungphan.
Former world number one Srikanth on Tuesday got a bloodied nose after undergoing multiple COVID-19 tests and was miffed at the poor treatment of health officials at Thailand Open.
Thailand Open: Saina Nehwal, HS Prannoy test negative for COVID-19 hours after positive results, now cleared to play
Both the Badminton World Federation (BWF) and Badminton Association of India (BAI) confirmed the development.
Thailand Open: Kidambi Srikanth sustains bleeding nose, says poor treatment of health officials 'unacceptable'
Srikanth, who is scheduled to open his campaign on Wednesday against fellow Indian Verma, shared photographs of his nose bleeding after he was tested for the fourth time.
The Indian duo will be quarantined in a hospital in the Thai capital for 10 days, in accordance with local rules. Saina's husband and fellow player Parupalli Kashyap too has been taken to hospital, but his results are awaited.
Thailand Open 2021: Competition not easy despite absence of Chinese and Japanese shuttlers, says Chirag Shetty
While China had withdrawn after a surge of COVID-19 cases in Thailand, Japan pulled out at the last minute after world no 1 Kento Momota tested positive for COVID-19.
The Thailand Open is the first of three consecutive tournaments played in strict bio-secure conditions and behind closed doors in Bangkok, culminating in the World Tour Finals from 27 January.
There is no doubt that the world badminton body would have been influenced by the compulsion of holding these three tournaments in a delayed Olympic qualification year, and also by the fact that other sports like tennis and cricket have been holding major events successfully, without causing a spike in Covid-positive cases.
Indian badminton contingent clears COVID-19 test, set to start training for upcoming events in Thailand
The players will also now have access to physio in their rooms but they will have to take prior appointment as part of the protocols in place.