Throughout his sporting career, Yavaser trained full-time as a member of the wrestling squad for Gebze Belediyesi SC İzmit, under his personal coach and mentor Turan Ceylan.

[2] Yavaser emerged himself into a sporting fame at the 2004 European Championships in Ankara, where he ousted his Georgian rival Revaz Mindorashvili in the final match 3–2, and ran off the mat for the gold medal in front of the home crowd.

[4][5] Yavaser lost his opening match 6–0 to Ukraine's Taras Danko, but soared smoothly with an easy victory over Armenia's Mamed Aghaev, who was immediately disqualified for infringing the rules of the tournament.

[6][7] At the 2005 Summer Universiade in İzmir, Yavaser enchanted the home audience inside the hall, as he turned down South Korea's An Jae-Man on the ring for the bronze medal with an astounding 3–2 score.

[8][9] The following year, Yavaser continued his medal streak with a silver in the same class at the European Championships in Moscow, before taking off his two-year break from wrestling to focus on personal commitments.