INDEPENDENCE, Ohio -- Cleveland Cavaliers shooting guard JR Smith underwent an MRI on his achy right elbow Monday, making him doubtful for the regular season opener against the Toronto Raptors.

Smith, who missed practice Tuesday afternoon -- the final one before the team was scheduled to leave for Toronto -- was diagnosed with elbow soreness. The MRI showed no structural damage.

The veteran had been wearing a wrap around his right elbow recently and did not participate in the preseason finale this past Friday night.

When approached by cleveland.com about the injury while the team was at Michigan State University, Smith joked, "Too much shooting, not enough passing."

It's the second injury setback for Smith, who has had a bumpy few weeks ahead of the 2018-19 regular season.

He was held out of the annual Wine and Gold Scrimmage in Dayton as well as the exhibition opener against Boston because of hip soreness. When he finally returned for the second matchup against the Celtics, Smith got into a scuffle with Aron Baynes and Marcus Smart, leading to a $15,000 fine.

His absence for some of the preseason, combined with a logjam on the wing, has led to Smith having an uncertain role. When listing off primary reserves, head coach Tyronn Lue didn't include Smith's name, indicating that the three-year starter hasn't been able to carve out a specific role.

The five reserves -- at least ones with solidified spots going into Wednesday's matchup against the Raptors -- are Collin Sexton, Jordan Clarkson, Kyle Korver, Sam Dekker and Larry Nance Jr.