Tennis: Sinner survives, Djokovic sizzles as Australian Open bakes in heat

Sinner overcomes cramp, searing conditions to beat Spizzirri American women dominate before play halted on outdoor courts Djokovic claims 400th Grand Slam match win in cooler evening Japan's twice champion Osaka pulls out with abdominal injury Swiss Wawrinka goes down fighting in final Australian Open Jannik Sinner battled back from the brink of a cramp-induced breakdown to keep his Australian Open title defence alive after extreme heat halted play on outdoor courts at Melbourne Park while Novak Djokovic escaped the furnace to forge on. Iga Swiatek continued to misfire in her hunt for a maiden Melbourne Park crown and a career Grand Slam, the second seed singed in her 6-1 1-6 6-1 win over...