WATCH: World No. 222 Ramkumar Ramanathan beats top seed Dominic Thiem

New Delhi: India's Ramkumar Ramanathan registered the biggest win of his career with a 6-3, 6-2 second round upset of top seed and World No. 8 Dominic Thiem at the Antalya Open on Tuesday.

Ramkumar Ramanathan, ranked 222 in the world, reached only his second ATP quarterfinal with the victory over the Austrian. Ramkumar's previous best performance was a quarterfinal appearance at the 2016 edition of Chennai Open.

The 22-year-old was dominant in the first set and sailed to a 6-3 win. He wasted three break points in the second set before breaking the world no. 8 in the fifth game.

See video here:

World No.222 beats world No.8! 

Ramkumar Ramanathan shocks Dominic Thiem in Antalya... pic.twitter.com/RDxPOOouPg — Tennis TV (@TennisTV) June 27, 2017

"I worked really hard for this," he said after the match, "Thank you to the crowd for coming out and cheering. I like the grass. Courts are fast. I took my chances and it worked out. I’m having a great time here and thanks to all the organisers."

Congratulatory tweets poured in from all over to appreciate the effort of Chennai lad.

See some reaction here:

Tremoundous win by Ramkumar Ramanathan over a top10 player. Congrats @ramkumar1994 #AntalyaOpen #Turkey #RamanathanvsThiem

— Rohan Bopanna (@rohanbopanna) June 27, 2017

Huge day for Indian tennis.. #ramkumarramanathan beats a top 10 player in a singles match.. What an effort. Take a bow sir #thiem — Abhishek (@banerjee06) June 27, 2017

Proud moment for Indian tennis as Ramkumar Ramanathan beats world no. 8 Dominic Theim!!! #AntalyaOpen — Anish Telkikar (@telkikar_anish) June 27, 2017

Did Ramkumar Ramanathan just beat Dominic Thiem in #AntalyaOpen? Straight sets. Grass court. What a surprise and delight! — Pratik Bakshi (@PratikBakshi) June 27, 2017

Dominic Thiem just dropped the opening set 3-6 to Ramkumar Ramanathan. Feeling so conflicted as both my worlds clash. #AntalyaOpen

— Nikhila (@kokudum) June 27, 2017

Ramanathan had entered the tournament through the qualifiers. The Indian had earlier defeated the 72-ranked Brazilian Rogerio Dutra Silva in the first round.

He will next face Marcos Baghdatis of Cyprus in the quarters.