The Hornets hardly hit anything in overtime, going 2 of 11 from the field.
"That was huge, no question," Casey said. "Those are the kind of big-time plays we've struggled with sometimes, but tonight we got it."
The Hornets tied the score three times in the third quarter and again on Ryan Anderson's clutch 3-pointer near the end of regulation but could not pull ahead. Vasquez missed an open 3 in overtime that would have given them a 96-95 lead.
"The energy we expended to come back in the fourth may have hurt us in overtime," Hornets coach Monty Williams said. "You have to tip our hat to (the Raptors). They did what they needed to do in overtime."
Lowry scored a fast-break layup off Ryan Anderson's turnover to spark a run that put the Raptors up 81-68 midway through the fourth quarter.
The Hornets responded with a quick 8-0 spurt on a three-point play by Davis, two free throws from Vasquez and a 3-pointer by Ryan Anderson that cut the deficit to 83-78 with 4:04 left.
"We had that momentum to force overtime," Davis said. "We tried to use all of our energy and momentum from the crowd to stay in the game, but we were not making shots. We were missing layups. It's tough because we had a second chance to get back in the game."
Toronto scored 23 points off 16 New Orleans turnovers. The Hornets forced only seven miscues, getting five points off them.
The Raptors also took advantage of several Hornets droughts. New Orleans missed 11 of its last 14 shots in the first half and went cold in the second half, making only three field goals from the 3:30 mark of the third quarter to the 6:15 mark of the fourth.
The Raptors led 48-42 at halftime despite shooting 16 of 41 from the floor (39 percent) and 1 of 12 from 3-point range.
NOTES: Hornets reserve forward Jason Smith returned from a seven-game absence due to a torn labrum, scoring two points in 12:10. ... Toronto outscored New Orleans 49-31 off the bench. ... Hornets center Robin Lopez, who has 85 points in his last four games, finished with nine on 3-of-8 shooting. ... Ryan Anderson had a game-high 12 rebounds.