By james art 
Willum Willumsson’s first-half goal was enough to give Birmingham City a win over Sutton United and send the League One leaders through to the second round of the FA Cup.
Williamson headed Paik Seung-ho’s cross from the left over goalkeeper Jack Sims and into the far corner of the net.
Jayden Harris had an opportunity to equalize for the National League side shortly before halftime.
He did well to pounce on Pike’s poor pass to Ben Davies and gallop from his own half towards goal only to fire wide.
Ashley Nadesan missed a late chance for Sutton when his poorly struck volley bounced off the ground and into the top of the net.