In 2015 season the duo began to appear in World Tour in more regular basis, their best result was the ninth-place finish in Prague Open. Their biggest international success came in the European Games in Baku. They won the gold medal after beating Austria's Schützenhofer / Plesiutschnig in the final in three sets (21–16, 14–21, 15–13). They were 8–11 down in the third set tie-breaker and had trailed for most of the set, but in the end they scored three points in a row – including an ace by Betschart – and crowned the first ever European Games champions in beach volleyball. After the match Betschart admitted that the victory was unlikely to come: "It is unbelievable. Didn't expect it. We were behind them all the time." Following the success at the European Games, the duo made their debut in European Championships in senior level in Klagenfurt, Austria but they struggled throughout the group phase and eliminated after losing all three group matches. They put the disappointment behind and made their first podium at continental level after finishing in third place at CEV Satellite tournament in Timișoara, Romania. Then, they went on to win gold medal at the U22 European Championships in Macedo de Cavaleiros, Portugal. They continued to their success at Coop Beachtour, with claiming two tournament wins in Geneva and Rorschach. At the 2015 Swiss National Championships, the duo again move up one place and won their first national championship medal with a third-place finish. At the end of the season Betschart and Eiholzer decided to end their eight-year long partnership.