Mainz 05: Kacper Potulski Scores Debut Goal for Poland. Just days after his debut for the Polish national team, Kacper Potulski made his mark with a debut goal. The 18-year-old defender played alongside stars like Robert Lewandowski in the 2-2 draw against Nigeria and scored the equalizing goal with a header from a corner kick. Kacper Potulski is a talented young player for Mainz 05 and the Polish national team. His debut goal is an important step in his career. The defender will continue to make important contributions for his team. Kacper Potulski is an important part of the team and will continue to make important contributions. The 18-year-old is a talented young player and will continue to make important contributions for his team. Kacper Potulski is an important part of the team and will continue to make important contributions. The defender will continue to make important contributions for his team. Kacper Potulski is a talented young player for Mainz 05 and the Polish national team. His debut goal is an important step in his career. The defender will continue to make important contributions for his team. Kacper Potulski is an important part of the team and will continue to make important contributions.