The purpose of this study was to analyse corner kicks at the 2018 FIFA World Cup to investigate if there was an association between the type of runs attackers make and the number of attacking opportunities created. Additionally, to further explore defensive behaviours and attacking tactics from corner kicks. Analysis was performed on 531 corner kicks in the 64 matches in the 2018 FIFA World Cup. Using an observational methodology, the following performance indicators were analysed: defensive players on the post, defensive marking system, area of delivery, type of corner and the number and type of attacking runs. There were 22 goals scored (4.1%) and 163 (30.7%) attacking opportunities created from corner kicks. There was a significant association between the number of decoy runs made by the attackers (p = 0.015), the number of blocking runs made by the attackers (p = 0.002) and the number of static attackers (p <0.001) and these leading to attacking opportunities. This suggests, decoy runners can distract defenders, dragging them to different positions, which can create space in the box for those attackers who are making runs to the ball to shoot. Blocking runs create space in the box as these runs are designed to stop the defenders from entering the zone where the ball is delivered to. This gives attackers more time to act and shoot. Static attackers can create space in the box as it does not move defenders to the ball, although having a high number of static attackers is not beneficial. Creating space in the box also gives attackers a clearer shot at goal as there are less players to intercept the shot. However, there were no significant associations found between attacking opportunities and defenders on the post, marking system, area of delivery or type of corner (p > 0.050).