Thomas Tuchel had referred to defeat against West Brom, his first since becoming Chelsea coach, as a “slap in the face” and four days later his team might have been hit even harder in Seville. Porto though couldn’t land the punch they kept trying to throw and in the end it was Chelsea who delivered what could well prove the knockout blow, close now to a first Champions League semi-final in seven years. For much of the night Chelsea had held on to a slim lead given