The ace Indian shuttler who is 9th seeded at the Games, defeated world number 2 Wang Yihan of China to knock her out.
This was Sindhu's maiden appearance at the Olympic games, and in her first appearance, the girl from Hyderabad is on the verge of clinching a medal.
After triumph at Rio, India Today spoke to PV Sindhu's parents. Speaking about her daughter's success at the Olympic Games, mother P Vijaya said: "It was a very tough match. The last few points were crucial. It was a very happy moment for us.
"I spoke to Sindhu. She is also happy and excited about the win. I congratulated her and asked to do well in the semi-final as well."
The badminton star will next face Japan's Nozumi Okora, who is world number 6, in the semis on Thursday evening 5:50 PM (IST).
Sindhu's father P Ramana too expressed his happiness on his daughter's exceptional performance. He stressed on the fact that how Sindhu loves the sport. Ramana said: "It's all her interest. As parent, we have done our job by encouraging our child. And this is what we have got in return."
Ramana further credited her coach and former Indian badminton star Pullela Gopichand for all the success. He lauded Gopichand for his efforts and guidance.
He added: "Gopi has moulded Sindhu into a champion. He has taken care of her game and has helped her.
"Sindhu displayed a lot of confidence in her quarter-final game. I think it is a result of Gopi's inputs in the training sessions. Gopi has also been motivating her by being present at the venue," Ramana said.
Sindhu's father also shed light on how his wife and himself battled against odds to help Sindhu realise her dreams.
"We have been encouraging her right from her childhood - right from dropping her to the training center in the early hours of the day to giving emotional support."
Finally P Ramanahas some very important advice for the Indian parents. "My daughter has completed her graduation and is now pursuing a postgraduate degree. At the same time she is performing well in sports. Every child has the inborn talent. Parents should realise the importance of sports as well," said the proud father.