Action especially physical one-on-one showdowns have never been Singer's strength. When they do happen, they are often very stylised and not that dynamic.
However, many of the characters have powers that don't lend themselves to physical brawling (of the type used -- dare I say overused -- in Civil War) because they project energy from a distance (Cyclops, Storm, Havok, Banshee), manipulate or project matter from a distance (Jean, Magneto) or are confined physically (Xavier), or operate at a short range (Psylocke who uses psi-weapons at close range, not exactly hands-on with the opponent).
It only really leaves Wolverine, Quicksilver, Mystique, Angel and Nightcrawler ... and of those, Angel is also largely a 'from a distance' character because of the flying and the wing-blades though we did see him being more physical with his wing talon in the Berlin cage-fight.
Most of the possible physical battles that could happen have happened - Wolverine v Mystique, Wolverine v Deathstryke, Nightcrawler v humans (X2), Wolverine v Sabretooth, Beast v Azazel, Beast v Psylocke, Nightcrawler v Angel. There was a deleted sequence with Nightcrawler v Toad in X2 that I hope we can still get to see.
We need someone like the fight choreographer from Civil War to get some brutal fight scenes in the next film. I'd love Nightcrawler v Toad though that's leaping/teleporting and not hands-on brawling...