Cub Swanson knocks out Nate Landwehr in first round

Cub Swanson defeated Nate Landwehr by knockout in the first round. The finish came quickly and decisively in what was described as a clear farewell fight. This appears to be Swanson's retirement bout, ending on a strong note with an early stoppage victory. Details about the specific strike or sequence that led to the knockout were not provided in the post.