The Serbian former world No.1 played in great discomfort with a recurrence of his right elbow injury.
Petriashvili scored a dominating 7-0 victory over Satender Malik in the super heavyweight category.
Chung will now face American bolter Tennys Sandgren in the quarter-finals on Wednesday.
The journey of the girl from Hisar, Haryana hasn't been easy.
Nothing offensive about ‘Padmaavat’: FDCI President
Shah Rukh Khan hopes to find warmth in cold Davos
Kamal Haasan foresees bright future for digital in India
Hoping for best: Sidharth on ‘Aiyaary’, ‘Pad Man’ clash
Sridevi and Janhvi’s night out with friends, family
Meryl Streep thinks Trump would love ‘The Post’
Shraddha Kapoor looked elegant in a pink embroidered Anarkali at the inauguration of ‘The Wedding Junction’ .
Esha Gupta has raised the temperature with her latest look. She is grabbing eyeballs with apparent changes in her facial feature.
Thickness and volume differences in the grey matter of several brain regions could predict an increased risk of developing epilepsy.
Screening all women over 30 years age for breast and ovarian cancer gene mutations can be cost effective.