|Full name||Zafer Yelen|
|Date of birth||30 August 1986|
|Place of birth||Berlin, Germany|
|Height||1.80 m (5 ft 11 in)|
|Berliner AK 07|
|1993–1996||MSV Normannia 08|
|1998–2005||Tennis Borussia Berlin|
|2005–2009||Hansa Rostock II||30||(14)|
|2015–||Berliner AK 07||8||(2)|
* Senior club appearances and goals counted for the domestic league only and correct as of 28 January 2016.
Yelen played for various clubs in Berlin, most recently for Tennis Borussia Berlin in the Junior League East, where he was discovered by the former Hansa Rostock coach Frank Pagelsdorf. He then got Timo Lange, the coach of the league, to transfer him to FC Hansa. In the 2005–06 season, his first season in the adult area, Yelen scored 14 goals in 30 games for the second string Rostock team in the league. For the 2006–07 season, he advanced to the second division team where he was a regular player and his playmaking skills developed. He scored five goals in 26 starts and was promoted at the end of the season with Hansa Rostock to the Bundesliga.
Through his achievements in the second division he was also appointed to the Turkish national under-21 team and played on 7 February 2007 in his first game for them.
In the following 2007–08 Bundesliga season, Yelen completed 20 games for the Baltic city dwellers, but was immediately relegated to the second Bundesliga, whereupon Yelen initially sought a change in Turkey, which for lack of sufficient financial security did not come about. After the 2008–09 season with just two appearances for Hansa he tried again to force a change in Turkey. End of the season his contract was finally cancelled in Rostock, and Yelen moved to the Turkish first division side Trabzonspor. In July 2011, Yelen joined second division club FSV Frankfurt.
He was a member of the Turkish U-21 national team. He played twice in 2008 Toulon Tournament and five times in the 2009 UEFA European Under-21 Football Championship qualification.