#TMinusNetGeneration - The odyssey to greatness is getting closer! @NASA astronaut @astro_feustel is heading on Expedition 55 to the @iss in 4 days and @atpworldtour stars @johnrisner, @bigfoe1998, @donaldyoungjr, and @steveij345 have given their best advice on how they might play tennis in space! Who's game do you think would be best suited with no gravity?! _ #nasa #tennis #instasport #drewfeustel #netgeneration #instatennis #internationalspacestation #instaspace #USOpen