MarkB
Legend
The Mandalorian seems to have upgraded Beskar to being practically on par with Cortosis for resisting lightsabers.Pre Vizla lost though.
In the old EU some did go hand to hand with Jedi and win mostly Mandalorians. They kind of cheated though.
Boba Fett trained Leia's and Hans daughter to fight dirty. Was an interesting way they did it.
They had anti Jedi stuff (cortosis, phrik, ysalmari etc) as well which doesn't exist in the new cannon.
And there's always the chance that Gideon has/will perfect his midichlorian-infusing treatment and apply it to himself.