So, if it's classic Dante and non new "Ultimate" one, then the Hulk-like zombie with wide variety of feats at his average showing won't be of much problem to him.
He is MUCH faster than Grundy (Mach 4 at the best showing, plus Quicksilver for more) (of course, in the LOONG list of Grundy's appearances there should be a case or two of him catching the likes of Supes, Wonder Woman or Flash when they forgot they had superspeed, but PIS is PIS) and his weapons are more than able to hurt Grundy.
Durability (especially with Royal Guard in play) is also a factor. So no one hit knockout.
I give Dante 8/10 (leave two to PIS-ish victories that may be presented in the thread). In fact I'd love to have a good debate with someone who is a resident expert on Grundy...