Daniil Medvedev says he is not feeling the "extra pressure" of being the defending US Open champion after easing to a 6-2, 6-4, 6-0 victory over Stefan Kozlov of the US in the first round.

The Russian won the first grand slam title of his career last year when he defeated Novak Djokovic at Flushing Meadows, and started his defence in dominant fashion on Arthur Ashe Stadium on Monday, reports DPA. The world number one broke American outsider Kozlov eight times in a one-sided encounter in New York, in which he struck 37 winners and committed 19 unforced errors.