Malaysia's Intanon had the upper hand in the game from the beginning of the encounter. She outclassed Sindhu in straight games 21-13, 21-9 that lasted for 38-minute.
The unseeded Indian pair toiled hard for one hour and 15 minutes to beat their world no.6 Malaysian opponents 18-21 24-22 22-20 in a nail-bitting quarterfinal duel.
Bowing out of the competition were MR Arjun and Dhruv Kapila after losing 9-21 11-21 to English pair of Ben Lane and Sean Vendy.
Thailand Open: Shuttler HS Prannoy cruises to second round after hard-fought win vs Jonatan Christie
In the first game, Christie defeated Prannoy 18-21 but in the following two games, the 28-year-old put on some fine performances and ensured his spot in the second round.
Thailand Open: B Sai Praneeth withdraws after testing COVID-19 positive, roommate K Srikanth forced to quit
BWF said Praneeth had been "rooming with teammate Kidambi Srikanth at the official hotel" and so he too had to withdraw from the tournament.
Prayuth's warning was an apparent reaction to charges that his government has done too little to acquire adequate supplies of vaccines.
The Bangkok Criminal Court found the woman guilty on 29 counts of violating the country’s lese majeste law for posting audio clips to Facebook and YouTube.
Saina passed her first test on court, posting a straight-games victory over Kisona Selvaduray. Former World No 1 Srikanth was also in the zone, dismantling compatriot Sourabh Verma.
Sourabh failed to cross the opening hurdle, losing to Kidambi 21-12, 21-11 in two consecutive sets.
Ex-world no. 1 Srikanth left with bloodied nose, BWF says working with Thailand Open for 'comfortable' conditions
Srikanth is scheduled to open his campaign against compatriot Sourabh Verma on Wednesday.
Saina Nehwal, HS Prannoy test negative for COVID hours after positive results, cleared for Thailand Open
Saina Nehwal and HS Prannoy on Tuesday tested negative for COVID-19 hours after returning positive results.
The Badminton World Federation said Kidambi Srikanth is being attended to by a doctor and it is awaiting a medical explanation.
PV Sindhu crashed out of the ongoing Thailand Open in the opening round after losing the hard-fought match against Mia Blichfeldt.
Satwiksairaj and Ashwini stunned the sixth-seeded opponents 21-11, 27-29, 21-16 in the opening round of the showpiece event.
A walkover was given to Kisona Selvaduray of Malaysia, who was to play her first-round match of the Thailand Open against Saina on Tuesday.