Dwane Casey isn't worried that some bad losses might send his team off of the rails like a year ago.

Bad play and bad luck conspired the Raptors to a season-demolishing 4-19 start to the 2012-13 campaign. Once the losses piled up, the young squad could not pull itself out of the tailspin.

This season's schedule doesn't let up until mid-January, meaning the record might not be pretty by then. But the 2013-14 Raptors already have four wins in 10 contests and Casey believes this season's squad will be fine.

"It's a different feel because of what we went through last year," Casey said Saturday morning after the Raptors went through a practice in preparation for a visit by the Portland Trail Blazers on Sunday.

"We've kicked away a couple of games that we should have had, (but) I don't feel the mental letdown from those two games (like what constantly happened last year), we've bounced right back," he said.

The Raptors shook off a loss to Atlanta to beat Milwaukee the next day earlier this month, crushed Utah a day after losing in Indiana and rebounded from an awful offensive performance in Houston to top Memphis.

Casey said DeMar DeRozan and Rudy Gay have shown good leadership following tough losses, helping the team get back on track quickly. DeRozan said it was tough looking at the tape from Friday's loss to the visiting Chicago Bulls

"We messed up on a lot of our coverages. We let ourselves get frustrated," said DeRozan, by far the best Raptor on the night, with a career-best-tying 37 points.

"We all know what we have to do (Sunday) coming off of a tough game."

Showing the signs of maturity Casey had alluded to earlier in the day, DeRozan was unwilling to take any pleasure in his huge night.