Ersan İlyasova (born May 15, 1987)  is a Turkish professional basketball player for the Oklahoma City Thunder of the National Basketball Association (NBA). He has previously played in Turkey, Spain and the NBA Development League.
After playing with the youth team of Ülkerspor, İlyasova played professionally in the Turkish Basketball League with the senior squad of Ülkerspor throughout the 2004–05 season, averaging 4.5 points and 3.2 rebounds in eleven games. 
İlyasova was selected by the Milwaukee Bucks with the 36th overall pick of the 2005 NBA draft. In July 2005, he joined the Bucks for the 2005 NBA Summer League. On August 22, 2005, he signed with the Bucks. On November 14, 2005, he was assigned to the Tulsa 66ers of the NBA Development League, an assignment that lasted the entire 2005–06 season.  In 46 games for the 66ers, he averaged 12.5 points, 7.0 rebounds and 1.0 assists per game. 
İlyasova made his NBA debut for the Bucks on November 1, 2006 in a 105–97 win over the Detroit Pistons.  In 2006–07, he played 66 games for the Bucks, averaging 6.1 points and 2.9 rebounds per game. In June 2007, the Bucks tendered a qualifying offer to İlyasova to make him a restricted free agent.
Return to the NBA
Milwaukee Bucks (2009–2015)
In July 2009, İlyasova signed a multi-year deal to return to the Milwaukee Bucks. 
On August 3, 2011, İlyasova signed with Anadolu Efes of the Turkish Basketball League for the duration of the NBA lockout.  In December 2011, he returned to the Bucks following the conclusion of the lockout.
On February 19, 2012, İlyasova set new career-highs with 29 points and 25 rebounds against the New Jersey Nets, fitting just the third Bucks player in franchise history to record at least 25 points and 25 rebounds in a game, after Kareem Abdul-Jabbar (10 times) and Swen Nater (once). The feat hadn't been achieved for more than 35 years.  He subsequently earned the Player of the Week award for his performances from March 5–11.
On March 27, 2014, İlyasova was ruled out for the remainder of the 2013–14 season due to a right ankle injury. 
On March 26, 2015, İlyasova scored a career-high 34 points in a 111-107 win over the Indiana Pacers. 
Detroit Pistons (2015–2016)
On June 11, 2015, İlyasova was traded to the Detroit Pistons in exchange for Caron Butler and Shawne Williams.  On October 27, he made his debut for the Pistons in a 106–94 win over the Atlanta Hawks, recording 16 points, seven rebounds, three assists and one block in 34 minutes. 
Orlando Magic (2016)
On February 16, 2016, İlyasova was traded to the Orlando Magic, along with Brandon Jennings, in exchange for Tobias Harris.  The next day, he made his debut with the Magic in a 110–104 win over the Dallas Mavericks, recording 16 points, five rebounds, two assists and one steal in 23 minutes. 
Oklahoma City Thunder (2016–present)
|GP||Games played||GS||Games started||MPG||Minutes per game|
|FG%||Field-goal percentage||3P%||3-point field-goal percentage||FT%||Free-throw percentage|
|RPG||Rebounds per game||APG||Assists per game||SPG||Steals per game|
|BPG||Blocks per game||PPG||Points per game||PIR||Performance Index Rating|
Note: The Euroleague isn't the only competition in which the player participated for the team throughout the season. He additionally played in domestic competition, and regional competition if applicable.
Before İlyasova was chosen to play for the senior Turkey national basketball team, he was named the MVP of the 2006 FIBA Europe Under-20 Championship, after leading Turkey's junior national team to a silver medal in İzmir.