French-born Koulibaly was targeted by monkey noises and racist chants in Napoli's 1-0 defeat to Inter Milan at the San Siro on December 26, before being sent off for sarcastically applauding referee Paolo Mazzoleni.
The 37-year-old kept his usual cool during an unbeaten 87 off 114 balls as India chased down Australia's 230 with four balls to spare at MCG.
Deceuninck–Quick-Step's Viviani, the omnium gold medallist at the 2016 Rio Olympics and one of the world's leading sprinters, powered out of the pack to reel in Germany's Max Walscheid and claim the ochre jersey after the first of six stages.
China's sports administration and top judicial authority are drafting rules that would apply criminal law to doping cases, official news agency Xinhua said Friday.
The 48-year-old, an Olympic medal winner in shooting, captured his third Dakar title on Thursday in Peru to add to his 2011 and 2015 wins on the world's most gruelling endurance race.
On day six at Melbourne Park, the 23-time Grand Slam winner crushed Ukrainian teenager Dayana Yastremska 6-2, 6-1 before consoling her at the net as she burst into tears.