On January 2, 2016, Booker scored a then season-high 21 points in a 142–119 loss to the Sacramento Kings. Only Kobe Bryant, Tracy McGrady, LeBron James, Dwight Howard, and Kevin Durant scored 20+ points more than once at a younger age than Booker. He became the youngest Phoenix Suns player and the fifth-youngest player in NBA history to record a double-double behind LeBron James, Andrew Bynum, Giannis Antetokounmpo, and Michael Kidd-Gilchrist on January 6. On January 19, he scored 32 points in a 97–94 loss to the Indiana Pacers, setting a Suns' rookie record with six three-pointers. Booker became the third-youngest player in NBA history at 19 years, 81 days old to record a 30-point game, behind LeBron James and Kevin Durant, as well as the youngest Suns player to score 30 or more points in a game. On February 12, Booker scored 23 points in a close victory for Team USA in the 2016 Rising Stars Challenge. The following day, he competed in the NBA All-Star Weekend's Three-Point Contest, becoming the youngest contestant to ever participate in the event and only the fourth rookie to compete in the 30-year-old contest, joining Stephen Curry (2010), Kyle Korver (2004) and Dennis Scott (1991). He made it to the final round of the event, beating both James Harden and JJ Redick in a tiebreaker event after the first round, where he finished third behind the "Splash Brothers" – Stephen Curry and Klay Thompson (winner).