BoxRec

Williams-Tyson
McBride-Tyson

and to lesser extents (in that they didn't beat him)

Ruddock-Tyson
Botha-Tyson

Lets give James J Corbett a mention here, eh?
I don't know how intimidating Sullivan was, but it takes some nerve to pull that trick where Corbett made him enter the ring first, one of my favourite stories (true or not!).

If we are really going back in time, let's not forget little GEORGE DIXON, who had the guts to head into a part of the Deep, Deep South called New Orleans in 1892, and defend his title against a white fellow named Jack Skelly. I think it took incredible guts to do what Dixon did.

This was a hotbed era and area of racism, and Dixon didn't know what to expect heading down there. But Dixon refused to be intimidated, and handed Skelly a frightful beating.

As a result of this fight, Louisiana banned mixed bouts until the 40s or 50s. Texas too.

I'd say that equals Johnsons escapades against Jefferies - more than. Johnson probably had a small degree of security in the fact that he was so notorious, and the international press would have been present.
Not so George Dixon.
(still would not want to be in Johnson's shoes, though).

Hagler never got intimadated

He hauled ass when the skinheads started the bombardment though
Johnson would have thrown the bottles back!
(According to McCillvaney, Vito flattened one of the hoodlums with a left hook, 'sweeter than any he threw in the ring').