Top seed, Russian`s Daniil Medvedev made a winning return at the National Bank Open -- an ATP Masters 1000 tournament --, even as second seed Rafael Nadal of Spain has withdrawn due to a left foot injury, putting a question mark on his US Open preparations later this month.

Medvedev, who had enjoyed a breakthrough run to his first ATP Masters 1000 final in 2019, overcame Kazakhstan`s Alexander Bublik 4-6, 6-3, 6-4 in a rain-disrupted clash to kick start his North American hard-court swing on Tuesday evening.