Davis went unclaimed in the 2019 NBA Draft, but after he made an impression in the NBA Summer League, the Raptors signed him to a two-year contract. The Ole Miss product proceeded to provide impressive production off the bench for Toronto, appearing in all 72 games (four starts) during the pandemic-shortened 2019-20 campaign. In just 16.8 minutes per game, Davis averaged 7.5 points, 1.3 threes, 3.3 rebounds, 1.6 assists and 0.5 steals; on a per-36-minutes basis, that's 16.2 points, 2.8 threes, 7.1 boards, 3.4 assists and 1.2 steals. Davis proved to be an efficient shooter from all over the court, posting a 45.6 field-goal percentage while shooting 38.8 percent from three and 86.4 percent from the free-throw line. He scored in double digits 26 times and cleared 20 points four times. Given a chance to start Jan. 8 against Charlotte, the rookie racked up 23 points and a season-high 11 rebounds for his first career double-double. Nine days later, he scored 23 again, this time off the bench in just 23:38 on the court against Washington. On Feb. 2, Davis delivered his highest-scoring game at the NBA level so far, going 12-of-15 from the field with a personal-best six threes en route to 31 points against the Bulls. Davis went on to make six appearances for the Raptors during their 11-game playoff run, averaging 7.2 points and 2.2 rebounds across 14.0 minutes. He made his NBA postseason debut in Game 1 of the first round against Brooklyn, scoring 11 points with four rebounds in just 12 minutes. Davis added another 14 points with four rebounds and two assists in the deciding Game 4 of that series. Following the regular season, he was named to the All-Rookie Second Team.