Daniil Medvedev warns a player could die in US Open heat

Daniil Medvedev played in 90-degree heat (Seth Wenig/AP)

Daniil Medvedev warned a player could die in the 90-degree heat at the US Open.

Medvedev needed medical attention and an inhaler as he struggled in the hot and humid conditions before beating his fellow Russian Andrey Rublev.