In 2009, she first competed along with Alexandra Tsiavou in Women's lightweight double sculls during 2009 World Rowing Championships in Poznań. Giazitzidou and Tsiavou won the gold medal. The following year, the Greek duo won the bronze medal in Karapiro, and in 2011 Giazitzidou and her teammate won the gold again. They also won gold in the event in the 2009, 2010 and 2011 European Championships. Giazitzidou also won the 2009, 2010 and 2011 Under-23 World Championships with Triantafyllia Kalampoka, following the pair winning the silver in 2008. Giazitzidou won the bronze medal (along with Alexandra Tsiavou) at the 2012 Summer Olympics in London, in Women's lightweight double sculls. They won the silver medal in the same event at the 2012 European Championships.