Šiškauskas made his pro debut with Sakalai in 1996. He played two seasons with the club, averaging 11.3 points, on 60 percent shooting.
In 1998, Šiškauskas signed with Lietuvos Rytas of Vilnius. He played there until the 2003–04 season, and led the team to Lithuanian League titles in 2000 and 2002, and a Northern Europe League title in 2002. In 2002–03, he had his most successful season, averaging 16.4 points, on 68 percent shooting, and 3.4 rebounds.
Italy
Šiškauskas joined Benetton Treviso in 2004. He led them to an Italian League title in 2006, where he was named the Finals MVP, and to an Italian Cup title in 2005. He played in 32 EuroLeague games over two seasons with Benetton, and averaged 12.3 points, on 60 percent shooting.
Greece
In 2006, Šiškauskas signed with Panathinaikos, and he helped them win the EuroLeague in 2007. He averaged 11 points, on 51 percent shooting for the championship team. With Panathinaikos, he also won a Greek League title, and the Greek Cup, in 2007.
Russia
Šiškauskas joined CSKA Moscow in 2007. He helped to lead them to a EuroLeague title in 2008, and helped them reach the EuroLeague Final in 2009. Which, however, CSKA lost to Šiškauskas' former team, Panathinaikos. On May 1, 2009, he scored a career-high 29 points against Barcelona. Šiškauskas also won five Russian Championship titles (2008, 2009, 2010, 2011, 2012).
On May 13, 2012, Šiškauskas missed two vital free-throws, with 10 seconds remaining in CSKA's EuroLeague Finals game against Olympiacos Piraeus, which proved crucial in CSKA's 62 to 61 loss. He also missed the last second three-point shot in CSKA's EuroLeague Finals game against Panathinaikos, on May 3, 2009, which meant that CSKA lost that final, by a score of 73 to 71.[3]
Only one week after the 2012 EuroLeague Finals game, on May 21, 2012, Šiškauskas announced his retirement from playing professional basketball.[4] On May 16, 2014, Šiškauskas was named a EuroLeague Basketball Legend.[5]
National team career
Lithuanian junior national team
Šiškauskas played with the junior national teams of Lithuania. With Lithuania's junior national team, he played at the 1998 FIBA Europe Under-20 Championship.
After the 2008 Summer Olympics, he officially announced that he was stepping down from the Lithuanian national team as a player.
Player profile
Šiškauskas was a physical small forward, who could also easily play, both on offense and defense, in either the point guard or shooting guard positions, on the wing, and also in the paint. His excellent leaping ability, and his quickness, made him a surprising shot blocker, and one of the best one-on-one players and swingmen in Europe. He was considered the best defensive player of the senior Lithuanian national basketball team. He led the 2003–04 season of the Lithuanian League, in free throw percentage (90.6%).
On May 15, 2009, Šiškauskas signed a contract extension with CSKA Moscow. He signed through 2011. Šiškauskas said of the contract: "I feel like the right man, in the right place in CSKA. I am happy with both the team, and the organization. That is why I don't see any reason to think about changes. I feel myself as a part of history of a great club, which is aiming for the highest goals. And that's what absolutely matches with my character."