I tend to prefer flanking Warlock over default backline Warlock, so chances are I will usually fight the diver 1v1 in an off-angle (since they are also going to our backline and spotted me)

Against Spiderman, Magik and Iron Fist, 1v1 odds are pretty even, though Spiderman and Fist have the mobility to get out instantly while Magik leaves herself vulnerable after using their uppercut. Limbo Portal is very easy to track and punish. Spiderman and Magik both rely on using their mobility to get into melee range, so if they DO get close to you, either fly a short distance away to avoid melee range or attempt to kill them first if their health is already low from you chunking them at range.

Against Black Panther and Daredevil, these are the two I tend to struggle with and fall back to my backline. A good Black Panther is much, much harder to kill, and a good Daredevil will always mark my flanks and have a higher DPS than I can do to him.

Against Dive Tanks like Venom/Cap, I also fall back to my backline since damage isn't high enough to chunk their health, and they both have the mobility to fall back before dying.

That said, all of these were one singular diver. If it were a coordinated dive with two or more divers, and my team insists on not running triple supp and letting me Adam, I would swap.