Runes

Greater Mark of Insight

Singed is mainly magic damage. You can't go wrong with Greater Mark of Magic Penetration.

Greater Seal of Resilience

Greater Glyph of Shielding/Warding

Singed easily kites many strong AD champions. Greater Glyph of Scaling Magic Resist helps you sustain against AP champs such as Kennen and Vladimir

This will greatly increase Singed's mobility. 405 MS with Boots.

Summoner Spells

MUST HAVE!

- Ghost and Insanity Potion go great together.

OTHER PICKS

- Jungle Singed; always be farming.

- Singed is susceptible to cc. Replace Teleport for this.

- Good spell for any champion. Although Ghost last for longer and is more effective with the combination of Insanity Potion.

- Great to use against Vladimir, Volibear and Dr. Mundo.

- Singed is too strong for this, but after the buff I would consider it to be viable.

DONT GET THESE

- Troll spell. Well it ain't as bad as Revive.

Abilities

PASSIVE: Empowered Bulwark - Increases Singed's health by 25 for every 100 mana he has.

Wonderful passive. Works great with Frozen Heart or Rod of Ages. However dont just build mana on him, he isn't Ryze.

FIRST ABILITY: Poison Trail - Toggle: Lays a poisonous trail behind Singed which deals 22/34/46/58/70 (+30% of ability power) magic damage per second.

SECOND ABILITY: Mega Adhesive - Singed throws a vial of mega adhesive on the ground causing all enemies who touch it to be slowed by 35/45/55/65/75% for 5 seconds.

THIRD ABILITY: Fling - Singed flings an enemy over his shoulder, dealing 100/150/200/250/300 (+100% of ability power) magic damage.

The best of Singed. Use this to your advantage when you catch an enemy (mainly dps carry) out of position. Fling can backfire and cause your whole team to die. Make note that and can leave you mana hungry early game.

ULTIMATE: Insanity Potion - Singed drinks a potent brew of chemicals, granting him 35/50/65 enhanced ability power, armor, magic resistance, movement speed, health and mana regeneration per 5, and 10/20/30% crowd control reduction for 25 seconds.

Lane Phase

Singed is a great farmer and solo top. Just use poison trail on minions. Keep pushing lane and always take the next minion wave past the enemy turret. Be sure to ward around yourself. Harassing is also a good technique to stop the enemy from farming up. Fling them and let them chase you around until they realise they are low on health meaning they will turret hug and miss most their last hits. If they don't back away you can always Fling them again and kite around the bush. I always make sure I have enough mana to do this. Otherwise just casually farm and be wary of jungle ganks. When enemy jungler ganks it's very easy for you to earn double kill (only if junglers are: Sejuani Dr. Mundo Shyvana Volibear). These champions are easily kited by your superiority and mobility. Just pop Insanity Potion and run around like hell, if they get near turret Fling them and run forward. If enemy mid ganks too, you are most likely dead.

REMEMBER TO WARD!

Item Choices

START OFF WITH

OR

OR

Starting with Boots will increase your movement speed to 405!
Starting with Sapphire Crystal will increase your health by 50 and also help to rush that Catalyst the Protector. Starting with Cloth Armor is a good choice against AD Top and helps you choose items like Randuin's Omen or Thornmail. An alternative item could be Regrowth Pendant for sustain and building into a Philosopher's Stone.
I always grab Boots or Cloth Armor first but it's your choice and it depends solely on who you're against.

NEXT ITEM

Alternative choice if you are vsing AD; works effectively against Volibear who thinks he is Singed 2.0

MOVING ON

OR

Rod of Ages is quite a must on Singed. This will improve his late game sustainability. Choice of boots are situational, but I mostly grab Mercury's Treads you already move fast enough.

WHAT COMES NEXT?

You definitely must grab Force of Nature!!! It improves your Insanity Potion. It has good magic resistance and an excellent passive.

A good item vsing AD. Make sure you don't rush it too fast, because you want to utilise Heart of Gold passive a little longer.

SITUATIONAL ITEMS

AGAINST HEAVY AP

OR

OR

OR

OR

You may choose one or two from the four, but remember you have Force of Nature so don't overdose on magic resistance. All are great items. Not a fan of Quicksilver Sash, Singed already has great escapes.

AGAINST HEAVY AD

OR

OR

OR

These four are excellent against AD/DPS. I mostly grab Sunfire Aegis or Thornmail. Sunfire Aegis will get you alot of killsteals or kills. I went 15/4/30 with Sunfire Aegis in my build.

AGAINST BOTH!

OR

EXTRA SURVIVABILITY

Good item, synergizes well with Force of Nature. Be careful if the enemy has Kog'Maw or Madred's Bloodrazor.

Beating TOP? Grab this and combine it with Guardian Angel = Never Die. 9/10 of time you won't need this anyway.

Rylai's Crystal Scepter

PROS

CONS

Although it may seem to be expensive and worthless; this item is apparently very good on Singed.
It is very effective in bringing down chasers and fighters such as Renekton.
I used to hate this item and realised I could bring down chasers and save teammates with the Poison Trail] and slow proc. Singed is all about disrupting enemies from the teamfight, this item can effectively combine with [[Fling and bring down the out-of-position carries. This item will work effectively against strong chasers such as Tryndamere and Volibear. Build this item before Force of Nature or Rod of Ages, then build Catalyst the Protector into a Banshee's Veil instead.
I ONLY RECOMMEND THIS ITEM IF YOU ARE NOT BEHIND IN FARM!

Possible Match-ups

EASY

Start with Cloth Armor or Boots and build a Warden's Mail. Always ask jungler for ganks.

MEDIUM

Yorick has good sustain but can easily be shut down by your kiting ability

SEMI-DIFFICULT

Strong at level 9, has good poke and sustain, and kite/juke harder than Singed.

HARD

Apparantly Singed dominates nearly every champion, although some champions have an advantage; no one should really beat you at top

Conclusion

Thanks for reading my guide and I hope you learn something.
I also hope you try out this build because it is very effective and has worked for me. I win most of my games as Singed because Singed is lethal at top, with high mobility to roam and disrupt junglers.