Diego Costa saved the day once more for Chelsea, but he shouldn't have been awarded the chance to do so.
Costa scored the opener, which was later cancelled in the second half by Sigurdsson and Leroy Fer. Chelsea were trying hard to score the equalizer, until Branislav Ivanovic made his way into the Swans' box and unleashed a shot that was deflected by the defense.
While the ball was in the air, Costa's acrobatic finish made it into the back of the net. But his foot accidentally hit Kyle Naughton's head, which should have been considered a foul.
Costa's foot (using black socks) was a bit closer than Kyle Naughton would have wanted. This was enough to disallow his second goal of the evening.
Costa seems to have recovered his goal scoring form. He has sent the ball into the back of the net four times in the same number of games, something he wasn't able to do last season. Right now, Costa is the joint EPL top scorer alongside Mikhail Antonio and Zlatan Ibrahimovic.
