Who will be the 13 unannounced entrants in the Royal Rumble?

Royal Rumble 2018 — Some faces you know you'll see, others are less knowable.

With the big show in Philadelphia two days away, we know 17 of the 30 entrants in the traditional Royal Rumble match. They are:

Elias
Randy Orton
Shinsuke Nakamura
John Cena
Finn Balor
Baron Corbin
Matt Hardy
Bray Wyatt
Rusev
Aiden English
Apollo Crews
Titus O'Neil
The Miz
Tye Dillinger
Big E Langston
Kofi Kingston
Xavier Woods

This leaves 13 surprise entrants, though some surprises will be bigger than others. A combination of unannounced full-time stars, talent on loan from NXT, and a returning legend or two are to be expected, but which ones?

#1 Roman Reigns

Roman Reigns Royal Rumble — The Rumble will certainly be the Big Dog's yard again.

Fresh off his IC title loss, Roman Reigns isn't scheduled for a match on the card and as we learned last year, even if he was, he'll still be in the Rumble anyway. It's been defined by him in recent years and there's no way it'll stop now.

Since it's a foregone conclusion that he'll be in the main event of WrestleMania with Brock Lesnar, many consider him the favorite to win.

I personally don't think that will be the case since RAW has the Elimination Chamber next month (and maybe WWE has learned a thing or two since the last time this event was held in Philly), but Roman is a lock to be in the final four.