On March 25, he scored 59 points in a 125–92 loss to the Utah Jazz, becoming the first player in NBA history with 50 in a game in which his team lost by 30 or more. He also became the third player in NBA history to score 50 in a game in which no teammate reached double figures. On March 27, he scored 50 points in a 124–121 loss to the Wizards, becoming the youngest player in NBA history with consecutive 50-point games. He also became first player in franchise history to reach 50 in back-to-back games. On March 30, he scored 48 points in another Suns' loss, falling two points short of becoming the fifth player in NBA history to score at least 50 points in three straight games. On April 3, in a 118–97 loss to the Jazz, Booker sprained his left ankle, ruling him out for the last three games of the season. On November 23, 2019, Booker almost put up a triple-double with 35 points, a career-high 12 rebounds, and 9 assists in a 100–98 win over the Minnesota Timberwolves. From December 27, 2019 until January 7, 2020, Booker scored over 30 points in seven straight games, including a 40 point performance in a loss against the Memphis Grizzlies on January 5. This streak broke a franchise record for most consecutive 30+ point games in a row, beating a record previously set by Charlie Scott twice and Charles Barkley once. In addition, his streak from December 28 until January 7 made him the only player since the 1983–84 NBA season to record six straight performances of 30+ points and 6+ assists with 47% shooting efficiency. On January 28, Booker became the fourth-youngest player to reach 7,000 career points, behind only LeBron James, Kevin Durant, and Carmelo Anthony. Booker was named an All-Star on February 13, 2020 as an injury replacement after Damian Lillard suffered an groin strain injury a day earlier. He also replaced Lillard in the Three Point Contest, an event he had previously won, and finished as the runner-up behind Buddy Hield. Due to his mother's ethnic background, Booker drew interest from the Puerto Rican, Mexican and U.S. national teams. He played on the 2016 USA Select Team that trained against the 2016 U.S. Olympic team. In February 2020, he was named a finalist to play on the 2020 U.S. Olympic team. Booker's maternal grandfather is from Mexico. Booker's younger half-sister, Mya, has microdeletion syndrome, a genetic chromosomal disorder.