Ilgauskas was selected by the Cleveland Cavaliers with the 20th overall pick in the 1996 NBA draft. On August 1, 1996, he signed a multi-year deal with the Cavaliers. In the earliest parts of his career he suffered through a myriad of foot and ankle injuries. He spent the entire 1996–97 season on the injured list due to a broken bone in his right foot.
Despite being selected to the All-Rookie First Team in 1997–98 and signing a contract extension in 1998 that was worth $70.9 million over 6 years, Ilgauskas played in only 5 games over the next two seasons. On January 26, 2000, he had a surgery on a fractured navicular bone in his left foot.
He re-gained the starting center spot for the Cavaliers in 2000–01. He was injured again in December 2000 and was out for the season. The injury dealt a blow to the Cavaliers. After winning 15 out of 23 games with Ilgauskas, they finished with a 30–52 record.
He returned in December 2001 and was mostly used as a backup to Chris Mihm for the rest of the season.
Ilgauskas averaged 17.2 points and 7.5 rebounds in 2002–03. He was selected as an All-Star, but the Cavaliers finished with the third-worst record in team history (17–65) and landed the number one draft pick.
The Cavaliers drafted high school phenomenon and future NBA MVP LeBron James in 2003. James teamed up with Ilgauskas and Drew Gooden to form the core of the team. Ilgauskas only missed 9 games over the next three seasons and was selected as an All-Star again in 2005.
The 2010 NBA Playoffs marked the first time in Ilgauskas’ career in which he was not a significant part of the Cavaliers’ rotation. Ilgauskas saw only 69 minutes of floor time in the entire postseason, resulting in averages of 1.7 PPG and 1.6 RPG, far below his career playoff production. The Cavaliers were eliminated by the Boston Celtics in the Eastern Conference semifinals.
On July 17, 2010, Ilgauskas signed with the Miami Heat. The Heat’s signings of Chris Bosh, Dwyane Wade and long-time teammate LeBron James influenced Ilgauskas’s decision to join the Heat. On December 2, 2010, during the Heat’s first game in Cleveland, the fans cheered Ilgauskas in pre-game introductions, while booing the rest of the starters, including James. The Heat made it to the 2011 NBA Finals, but fell short to the Dallas Mavericks in six games.
In September 2011, Ilgauskas announced that he was retiring from basketball, saying he wanted to spend more time with his family as well as citing long-term personal physical fatigue and basic bodily wear-and-tear.
Career highlights and awards
2× NBA All-Star (2003, 2005)
NBA All-Rookie First Team (1998)
NBA Rookie Challenge MVP (1998)
No. 11 retired by the Cleveland Cavaliers