"They outplayed us in every phase of the game," Wittman said. "It's disappointing after we've been playing at a pretty high level. Tonight wasn't it."
Wittman, whose team lost 109-103 at Orlando on Wednesday, was especially upset to see the Wizards outrebounded by a wide margin, 61-37.
"Rebounding is effort," he said. "We didn't have that same effort tonight that we've had, and it showed."
JaVale McGee, who missed six of his eight shots and finished with eight points, shared his coach's frustration.
"We should have come out a little bit harder, we should have played harder D," he said. "We've got another game (Saturday at home against the Clippers) so we've definitely got to make up for it."
Linas Kleiza scored all of his 15 points in the second half, and Jose Calderon had a season-high 17 assists as the Raptors bounced back from consecutive blowout losses to Atlanta and Boston and improved to 2-9 without leading scorer Andrea Bargnani, who is out with a strained left calf.
Held scoreless in Wednesday's 100-64 defeat at Boston, Johnson hadn't reached double figures since Jan. 16 but bounced back with a strong showing in this one.
"Amir was a monster," coach Dwane Casey said. "He did a good job rolling to the basket and cleaning up the offensive boards."
Seven of Johnson's rebounds were at the offensive end. Toronto finished with 23 offensive boards to Washington's 11.
James Johnson scored 13 points and DeMar DeRozan had 11 as Toronto topped 100 points for just the third time this season, exceeding the 80.2 they'd been averaging without Bargnani. The Raptors scored 104 points Dec. 26 in an opening night win at Cleveland, and had 111 in a double-overtime win at Utah on Jan. 25.
"This was a game we definitely needed," DeRozan said.
Barbosa missed Friday morning's shootaround with flulike symptoms but showed no ill effects against the Wizards. He scored nine points in the second quarter and had six more in the third.
"Leandro picked us up in the first half, Linas took it over in the second and Amir was solid throughout," Casey said.
Booker said the Raptors played as though they were looking for payback for a Jan. 10 loss at Washington, the Wizards' first victory of the season following an 0-8 start.
"I know they remember us beating them so I know they wanted some revenge," Booker said.
Washington dropped to 1-10 away from home this season and has won just four times in 52 road games since the start of last season.
The Raptors were up 80-69 heading into the fourth and pulled away from there, leading by as many as 22.
Toronto, which led by 10 at the break, matched a season high with 55 first-half points.
Wizards veteran Rashard Lewis scored eight points, leaving him six shy of 15,000 for his career. When he reaches the mark, Lewis will join Paul Pierce and Jason Kidd as the only players to score at least 15,000 points, grab 5,000 rebounds and make 1,500 3-pointers.
Calderon's career high in assists is 19, set twice. His 17 assists were more than Washington's total of 13. ... Calderon also had a season-high eight rebounds, one shy of his career best. ... Kleiza returned for the Raptors after sitting out Wednesday with soreness in his surgically-repaired right knee. ... Wittman was the replacement when Casey was fired by Minnesota in 2007.