Denys Viktorovych Syzonenko (Ukrainian: Денис Вікторович Сизоненко; born April 13, 1984) is a Ukrainian former swimmer, who specialized in freestyle events. He is a single-time Olympian (2004), and a two-time relay medalist at the Universiade (2003 and 2005). He also trains for Dynamo Kiev swimming team, under his longtime coach Viktor Turchin.
|Full name||Denys Viktorovych Syzonenko|
|Born||13 April 1984|
Bila Tserkva, Kiev, Ukrainian SSR, Soviet Union
|Height||1.97 m (6 ft 6 in)|
|Weight||91 kg (201 lb)|
Syzonenko qualified only for the men's 4 × 100 m freestyle relay, as a member of the Ukrainian team, at the 2004 Summer Olympics in Athens. Teaming with Andriy Serdinov, Pavel Khnykin, and Yuriy Yegoshin in heat two, Syzonenko swam a lead-off leg and recorded a split of 50.05, but the Ukrainians missed the top 8 final by almost a full second, finishing in fifth place and tenth overall with a national record of 3:18.95.
At the 2005 Summer Universiade in Izmir, Turkey, Syzonenko helped out the Ukrainian team (Anton Buhayov, Oleg Lisogor, and Serhiy Advena) to upset their American rivals and claim the medley relay title in a final time of 3:38.49.
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Denys Syzonenko". Olympics at Sports-Reference.com. Sports Reference LLC. Retrieved 11 May 2013.
- "Swimming – Men's 4×100m Freestyle Relay Startlist (Heat 2)" (PDF). Athens 2004. Omega Timing. Retrieved 27 April 2013.
- "Men's 4×100m Freestyle Heat 2". Athens 2004. BBC Sport. 15 August 2004. Retrieved 31 January 2013.
- Thomas, Stephen (15 August 2004). "Men's 400 Freestyle Relay Prelims: South Africans Rock with a New Continental Record 3:13.84, Second Fastest in History; US Qualifies Second". Swimming World Magazine. Archived from the original on 27 September 2007. Retrieved 11 May 2013.
- "USA Wins Four Gold Medals on Sixth Day of World University Games". Swimming World Magazine. 17 August 2005. Archived from the original on 16 June 2013. Retrieved 11 May 2013.