Ganzey qualified for the men's 4×200 m freestyle relay, as a member of the Russian team, at the 2004 Summer Olympics in Athens. Teaming with Maksim Kuznetsov, Yevgeniy Natsvin, and Alexei Zatsepine in the second heat, Ganzey swam the third leg, and recorded a split of 1:50.18. The Russians finished the race in sixth place and eleventh overall with a final time of 7:23.97.