Get a good combo of spells and attacks that creats havoc on your opponent. If you time your attacks right, they wont be able to attack you back.
For instance. Do a knockdown... then when they are on the ground use a good debuff/DPS attack... the second they get back up, hit them with anotehr knockdown or a stun... keep them so they cant do any attacks and u win the fight easily.
Example: do a knockdown that lasts for 2 seconds... it also has blur vision... if u follow that up immediately lets say .2 seconds later with a stun, well then youve just stunned him while hes knocked down and has blurred vision... whats the point of that?.... let him recover just barely, then smack him with another stun/stifle/knockback/blur vision... so they cant get any casts off... inbetween time u hit them with debuffs and massive DPS...
timeing on your stuns etc... is crucial to winning a fast fight with little damage to you