No team in NBA history has come back from an 0-3 deficit. But, those teams still have to come back and play that last game. In 1996, the defunct Sonics took two from the 72-10 Bulls, before losing, after going down 0-3. The 2003 Blazers forced a Game 7 on the Mavs, similarly.
In 2010, the Orlando Magic fell behind 0-3 to the Boston Celtics and forced a Game 6. So, it’s definitely tough on DeMar DeRozan and the Toronto Raptors, but there is SOME hope. After all, in baseball, a team actually HAS overcome an 0-3 deficit to win.
DeMar DeRozan is definitely disappointed in how things have played out, which he told the media in the post-game interview. However, he said he is looking forward to his team just going out and getting a win, it starts there. He spoke on how the game fell apart for them, and they ultimately came up short, and where they go from here on out.