Boston and Toronto will play Game 5 of their Eastern Conference series to open the doubleheader, followed by Game 3 of the Western Conference matchup between the Clippers and Nuggets.
The Raptors lost Games 1 and 2 to the Celtics before winning Games 3 and 4.
The Raptors needed a buzzer-beating 3-pointer from OG Anunoby to win Game 3 and avoid a 3-0 series deficit, then grinded out a win in Game 4.
BOTTOM LINE: The Toronto Raptors and the Boston Celtics are in a 2-2 series tie in the Eastern Conference second round. The Raptors won the last matchup 100-93. Pascal Siakam scored 23 points to lead Toronto to the victory and Jayson Tatum scored 24 points in the loss for Boston.
The Raptors are 9-5 in division games. Toronto is fifth in the league shooting 37.4% from downtown, led by Matt Thomas shooting 47.5% from 3-point range.
The Celtics have gone 30-13 against Eastern Conference opponents. Boston ranks last in the Eastern Conference shooting 36.4% from 3-point range.
TOP PERFORMERS: Siakam is shooting 45.3% and averaging 22.9 points. Fred VanVleet is averaging 16.7 points and 6.4 assists over the last 10 games for Toronto.
Tatum is averaging 23.4 points and 7.0 rebounds for the Celtics. Kemba Walker is averaging 19.5 points and 4.3 assists over the last 10 games for Boston.
DURING THE PLAYOFFS: Raptors: Averaging 112.8 points, 45.6 rebounds, 26.9 assists, 7.4 steals and 5.1 blocks per game while shooting 45.2% from the field. Their opponents have averaged 104.1 points on 42.2% shooting.
Celtics: Averaging 107.4 points, 44.5 rebounds, 19.8 assists, 6.6 steals and 5.5 blocks per game while shooting 45.2% from the field. Their opponents have averaged 99.9 points on 40.2% shooting.
INJURIES: Raptors: None listed.
Celtics: Vincent Poirier: out (personal), Javonte Green: out (knee), Gordon Hayward: out (ankle).
The Associated Press contributed to this report.