Ghana youth international Ebenezer Assifuah scored his first Swiss Super League goal as Sion drew 2-2 at leaders Basel on Saturday night.
The 2013 FIFA U20 top scorer connected home from close range on 87 minutes to snatch the equalizer for the visitors.
The 20-year-old came off the bench in the 67th minute to replace Dimitris Christofi.
Assifuah was making his second appearance in the top-flight after making his debut last Wednesday in the 2-1 win over Lausanne.
Vanczak opened the scoring for Sion but Stocker drew Basel level in the 57th minute and Egypt star Mohamed Salah made it 2-1 with a quarter of an hour left.