Brad Beal/Jayson Tatum rivalry    13:10 How did Jayson turn into NBA's best three-point shooter   16:40 What is your favorite thing about Tatum    25:45 What haven't we seen yet?   Available for download on iTunes and Stitcher on Sunday, January 21. Celtics Beat is powered by RX Bar and eHarmony. Learn more about your ad choices. Visit megaphone.fm/adchoices