She won the triple jump silver medal at the 2004 Summer Olympics with a jump of 15.25m, after setting the Greek record in the preliminaries with 15.32m.
On March 19, 2011, Devetzi was given a two-year ban from athletics by the ΙΑΑF, due to her failure, on May 23, 2009, to submit to a drug test. The decision was controversial due to inconsistencies and irregularities in the report of the doping control officer.
|2002||European Championships||Munich, Germany||7th||Triple jump|
|2003||World Championships||Paris, France||8th||Triple jump|
|2004||World Indoor Championships||Budapest, Hungary||3rd||Triple jump|
|Olympic Games||Athens, Greece||2nd||Triple jump|
|World Athletics Final||Monte Carlo, Monaco||4th||Triple jump|
|2005||World Championships||Helsinki, Finland||5th||Triple jump|
|World Athletics Final||Monte Carlo, Monaco||1st||Triple jump|
|2006||European Championships||Gothenburg, Sweden||2nd||Triple jump|
|World Athletics Final||Stuttgart, Germany||2nd||Triple jump|
|World Cup||Athens, Greece||2nd||Triple jump|
|2008||Olympic Games||Beijing, China||3rd||Triple jump|
- Triple jump - 15.32 m (2004) - Greek record. 
- Long jump - 6.83 m (2006) - third among Greek long jumpers, only behind Niki Xanthou and Paraskevi Tsiamita. 
- Greek all-time list, women - Athletix