As sylas, You are way stronger than Sylas early. Invade him and try to fight him in the 1v1.

Make sure you apply as much pressure as possible by ganking often in the early game.

Remember to take those objectives. Unlike Sylas, you can solo those objectives quite easily.

If you see Sylas ganking nearby, don’t be afraid to counter gank. You’re a really strong counter-ganker!
 As sylas, You are much stronger than Sylas early. Invade him and try to fight him in the 1v1. Make sure you apply as much pressure as possible by often gauntling in the beginning of the game. Remember to take these goals. Unlike Sylas, you can solo these goals quite easily. If you see Sylas gaunting nearby, don't be afraid to counter the gank.