I hope the Grizzlies can squeak out a series win but I don't think they can beat the Warriors so much as the Warriors bad habits can cost themselves the series.
I'm not worried about the Grizzlies at all as an opponent. As I've said all along, they're a pretender and will only go as far as Ja can carry them and in the postseason it's much easier to shut him down, or at least gameplan against him, than the regular season.
The Warriors fall in love with bad shots too often and Draymond being their only big makes their margin of error quite small since they're not a good defensive or rebounding team.
The series in the East are much more competitive and entertaining, IMO. I worry more about how the Suns would match up with the Heat, Bucks, and Celtics than any remaining teams in the West. Philly might have been worth considering before Embiid broke his face but that exposes how bad they are without him as well as how bad of a coach Doc Rivers is.