Arsenal won away to Chelsea on Wednesday night, taking a big step towards reaching the League Cup final.
The Gunners won 3:2 at Stamford Bridge, and will play the return match at the Emirates on February 3.
Ben White and Viktor Gyokeres scored for the visitors to make it 2-0, while Alejandro Garnacho narrowed the score to 2-1. Martin Zubimendi restored the visitors' two-goal lead, while Garnacho scored again seven minutes from time for the final score.