By JOHN PYE and DENNIS PASSA AP Sports Writers MELBOURNE, Australia — Limping and desperately trying to stretch out cramps in his arms and legs, Jannik Sinner had just gone down a break in the third set when the extreme heat rules saved him. Play was suspended for eight minutes while the roof was closed on Rod Laver Arena on Saturday afternoon (Friday night PT), and the two-time defending Australian Open champion returned a revitalized man. After seemingly being on the verge of an unlikely exit – one of his coaches, Darren Cahill, was urging the 24-year-old Italian just to stick it out for a few more games – Sinner won five of the next six games to take the set against 85th-ranked American...
