It's #Eclipse 101 time w/ "astronomers" @petra.kvitova @aradwanska , @kristinamladenovic93 🤓 & animal call expert @domicibulkova 😂🦉🐺🌘😎 (via @connecticutopen) #USOpenSeries _ #tennis #kvitova #cibulkova #radwanska #mladenovic #ctopentennis #newhaven #instasport