Diego Costa downs 10-men Gunners

Some things never change. Diego Costa drawing a red car for an Arsenal defender and scoring afterwards.

Exactly what he did in the first leg at Stamford Bridge when Chelsea won 2-0 happened again at Tthe Emirate as Arsenal fell tho Guus Hiddink's men courtesy  of Costa.

It was in the 18th minute when Costa evaded Per Mertesacker who was the last man in Arsenal's defence and the Chelsea striker was brought down.

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A straight red card was show to Mertesacker and correctly so.

After a intense pressure from Chelsea, Costa pounced on a Branislav Ivanovic to finish past Petr Cech in the 23rd minute.

Chelsea were on top now, controlling possession as they made use of the one-man advantage.

Towards the end of the first half, Arsenal started to show intent and were unlucky not to go level courtesy of unimpressive finishes from Theo Walcot and Mathieu Flamini.

Arsenal continued to get half chances especially after the introduction of Alexis Sanchez.