Wayne Odesnik has announced his retirement from the tennis circuit after receiving a 15-year doping ban.

The 29-year-old tested positive for several banned substances, both at the end of 2014 and the beginning of this year.

The American, ranked 267th in the world, issued a statement maintaining his innocence, claiming he had accidentally ingested substances through taking an over-the-counter supplement.

He was previously sanctioned in 2010 for possession of human growth hormone, but he denied ever taking the performance-enhancing drug.