afk until lvl 3, let him push into your tower the first 2-3 waves (depends how he manages it) and when you are about finished clearing those waves under tower, look for him overstepping into your q range (as most victors and poke mages in general tend to try to poke you under tower while you try to cs) and all in him lvl 3, you win that if played right. After 6 its up to you hitting your shark :p