MELBOURNE, Australia — Play was suspended at the Australian Open Saturday after the tournament’s Heat Stress Scale reached the level required to close the roofs on the three biggest stadiums, and pause matches entirely on outdoor courts. World No. 2 and defending champion Jannik Sinner benefited most from the rule. He was severely cramping at 3-1 down in the third set of his match against Eliot Spizzirri, barely able to serve or move, when the HSS reached 5.0. Tournament rules dictate that play
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