Somdev, ranked 177th, lost 3-6 6-3 3-6 to his 18-year old opponent, whose father is a boxer and mother a tennis coach.
Somdev has not won a main draw singles match on ATP Tour since September 2014 when he had beaten China's Xin Gao at Shenzen Open.
He had a chance to change that stat as he led 3-1 in the opening set but lost five games on the trot to hand his rival a one-set lead. Somdev won the second, stretching it to a decider but dropped serve in the sixth game and could never comeback.
Rublev, to his credit, overpowered Somdev with his strokes, especially his forehand which he used smartly to play majority of his shots to a weak backhand of Somdev.
Somdev saved two break points in his first service game but a forehand error after a long rally put him down by another. He saved that too with a winner, set up by opening up the court and held for a 2-0 lead when Rublev's attempted drop shot fell short.
Somdev earned a chance to go 3-0 up by placing a perfect backhand drop shot but could not cash in on as Rublev finally got on board.
Somdev Devvarman Crashes Out of First Round in Chennai Open - Tennis News