Hi.This is my first build with one of my favourite chars:Renekton.Renekton is a meele char,and can overcome a 1 vs 1,if you´re loosing of life.Well,I start with thr runes:

Why always the same number of runes?Well,It´s a tactic:
Why 8 greater mark of strenght?;because Renekton needs attack damage,and,1 greater mark of desolation for a little armor penetration.The glyphes and the seals are the sames,and the quintessence for:attack speed,more attack damage,and more armor penetration.And you can ask yourself this:why haven´t any critical damage?Well,with this runes,isn´t necesary,you´ve got good attack damage,good speed attack,and good armor penetration.Critical damage,for what?

Well,the masteries are:21-9-0,because,Renekton need attack,only attack,and a little defend,The Dominus are very good for defense and life.

We arrive to the longest part of this build:
DORAN BLADE:The basic item,10 damage,a little life steal,and 100 life.It´s a good item for start the match.
IONIAN BOOTS OF LUCIDITY:This item are very good for Renekton,and the reason is simple:the 3rd and the 2nd skill´s CD,are very big.If you can finish the item in few time,better.Moreover,can reduce the CD of all skills.
FROZEN MALLET:This item is one of my favourites items:700 life,20 damage,and can slow the enemy´s character.Moreover,it´s a good combination with the 2nd = slow & stun company.
PHANTOM DANCER:Only word for this item:INCREDIBLE,55 attack speed(with the runes,a lot of speed),30 % the critical strike,and 15% movement.
THE BLOODTHIRSTER:well,60 damage and 15%life steal,nice in combination with the 1st skill,you can steal life and heal you with 1st skill.
INFINITY EDGE:Other fantastic item,brutal damage(75 damage)and 250 critic strike.No more words for describe this item:BRUTAL.
Well,if the match is very longest,you can make a little change:The DORAN BLADE for the HEXTECH GUNBLADE,because,have a little ability power,and more damage.

Well,I do this skill sequence because I love the 3rd skill,is very good for catch the rival,and,the 2nd for stun,and with rage,more stun,more damage on 3rd,and more heal on 1st.

Why GHOST and EXHAUST?well,the answer is easy=persue and catch:
The GHOST for run more,and the EXHAUST for slow the rival.
Why not HEAL?
Renekton don´t need heal,he´s got the heal in the 1st.
OTHER POSIBILITIES:
FLASH:The same duty that GHOST,but,for runners.
TELEPORT:For save turrets and try to kill the pusher.
DON´T:
CLARYTY:
Renekton hasn´t got mana
RALLY:
You´ve got a lot of damage with items,runes and masteries.

Well,I finish the build,I hpe you enjoy,and,sorry for the images,I haven´t any image,and sorry for my english (the dictionary helps me),and,is my first build.
Bye.