LIVE: Nike announces Cavaliers guard Kyrie Irving as new signature athlete Author:SI.com StaffPublish date:Dec 3, 2014Watch the live event below as Nike gets set to unveil their new signature athlete.Latest NewsAfter Facing Death, the NYC Marathon Has New MeaningRunners Take on Training, Motherhood and More, Side by SideAngela Manuel Davis Is Putting a New Spin on Living With PurposeHow Fitness Trainer Ashley Joi Learned to Find Joy Through MovementSports Illustrated's Fittest 50 2022