Soaring temperatures in New York have prompted US Open tournament officials to bring the heat rule back into effect.
The measure to allow breaks in matches was implemented for three days in the opening week as the players battled sopping humidity and scorching heat.
Temperatures were forecast to hit up to 32.2 degrees Celsius on Monday but the conditions did not deter fans flocking to Flushing Meadows for day eight of the tournament, as former champions Novak Djokovic, Roger Federer - playing unseeded Australian John Millman - and Maria Sharapova bid to book their quarter-final spots.
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