Jelle Sels defeated Nicolas Alvarez Varona in the final of the ITF Alkmaar 250 on clay on 27 June 2021. The Belgian secured the title in what marked a significant achievement on the ATP Challenger circuit. Sels' victory over Alvarez Varona underlined his growing competitive standing at this level, with the final representing an important step in his development as a professional player. The result provides Sels with valuable ranking points and tournament momentum heading into the remainder of the season.