If you are worried about invisibility improved or other wise I find that cyberears with amp, sound filters, and the spacial recognisor pair up real well with grenades or wide burst.
"Hum, I hear foot steps and don't see any one coming from right over there where the noise is coming from. Well I guess I will just make sure, HEHEHE"
Spray weapons and paint do wonders for mage visibility. exspecialy if they are using ganky mirrors or fiber opics. Oh they work good on faces to.
Flash packs. If you have flare comp.
Don't under estimate the power of a black cloth bag with the draw string replaced with a zip tie. This is good for those stealthy guys.
Shoot the lights.
or you can just track him and steal his shoes (shoes in street Magic is slang for a mage body when he is projecting. ie "I left my shoes in the car") very funny.