Defending champion Osaka fizzles out of Australian Open 4:57am EST

MELBOURNE (Reuters) - Defending champion Naomi Osaka was knocked out of the Australian Open on Friday, falling 6-3 6-4 in a stunning upset by American teenage sensation Coco Gauff in the third round.  Full Article

Serena's record bid foiled by Chinese battler Wang 4:58am EST 

MELBOURNE (Reuters) - Serena Williams suffered her earliest exit from the Australian Open in 14 years on Friday, falling to China's Wang Qiang in a stunning third round reversal that left her bid for a record-equalling 24th Grand Slam title in tatters once again.  Full Article  

Athletics body to tighten rules after Nike's Vaporfly helps records tumble: sources 3:17am EST 

LONDON (Reuters) - Athletics' ruling body will tighten regulations governing shoe technology, two sources familiar with the matter said, after Nike's popular Vaporfly brand helped re-write running records and sparked debate about whether it was "technological doping."  Full Article