Lemme give you a tip for my main: 
Kite. (rush cdr, cleaver, lucidity, 14% from runes/masteries)
Q+W+auto E out, remainder q's to get away if he chases. In this combo he got maybe 1 auto off. If you're actually good with Riven you can E+auto+WQ q away.
Stormraiders is supposed to be good, though generally I don't do enough damage to actually proc it with these quick combo's unless I'm ahead. Tlords is decent too as your quick trade should just barely proc it.
Also, he'll be pushed in lvl 3. Call your jgler for a gank at the start of the game.
If you can burst him, he'll be screwed no matter what as he'll either have to pop his ult way too early (aka when you're still basically full health) or he can try to fight and die as he doesn't have enough damage to actually kill you if you keep kiting.
If you can't burst him, you might want to consider swifties for slow resist although Stormraiders is better when you're ahead (you can actually proc it!) since if you're behind Tlord's means he'll be able to W you and kill you.
@Riv mains
If i got something wrong, plz tell me.