Nightcrawler Vs. Deathstroke
Here's one that I thought would be a way good match. On one side you got a master tactician and arguably the best martial artist in DC. And on the other side you got a unique fighter who can attack from any angle and is also no slouch when it comes to hand to hand combat. So who would leave with the bloody sword and who would be left for the crows I think Nightcrawler is taking this one.
Nightcrawler:
If you don't know Nightcrawlers powers already than you need to get out from up under your rock that you've put a second mortgage on because he is one of the most popular xmen and an intricate part in their success. Nightcrawler can come out of nowhere and hit you then hit you from somewhere else before you feel the first hit he's a master fencer with any apendage(except that one...get your mind out of the gutter lol)and hand-to-hand combat. He has superhuman levels of agility, coordination, flexibility, and balance.
Deathstroke:
Deathstroke is one of the sickest DC characters I know about he has the strength of 10 men, heightened speed, agility, stamina, and reflexes. He also is able to use 90% of his brain making him a genius in tactics, he's also very adept at turning his opponents abilities against them. He also does have a healing factor that allows him to recover from fatal injuries but is not able to regenerate lost limbs and organs. He has fought Batman numerous times in which good ol' Bats is only able to fight him to a stale-mate, the only way he has defeated him is with his sidekicks. He is also an expert with guns, swords, and staffs(his primary weapon which can shoot energy blasts from either end).
So there are todays contestants let me know what you think in the comments(I'm gonna catch a lotta flak for this but i believe Nightcrawler would hand him his ass...sorry lol. Oh and I got my pictures from google.com)