What does "the edge" mean in this sentence?
Into the top six!
A brace from McTominay gave Man Utd the edge against Chelsea after a missed penalty
If a team has the edge over another team then they have done (slightly) better than their opponents. Here, the McTominay goal has meant that United have defeated Chelsea - but it was close! We can say that a team have edged the win - they have just about won the game.