The 2009–10 Cleveland Cavaliers season was the 40th season of the franchise in the National Basketball Association (NBA). The Cavaliers bested the season with a 61-21 record, earning them first place. The season saw LeBron James win his second MVP award.

After defeating the Derrick Rose-led Chicago Bulls in the first round, the Cavs couldn't go any further as they lost to the Boston Celtics in six games. Following the season, head coach Mike Brown was fired, James signed as a free agent with the Miami Heat, but would return to the Cavaliers in 2014, Shaquille O'Neal signed as a free agent with the Celtics and Zydrunas Ilgauskas also left the team to join the Heat.

After LeBron's departure, the Cavaliers did not make the playoffs again until 2015.

Stats with the Cavaliers
¹Did not start or finish the season with the Cavs.

*Spent the entire NBA Career with the Cleveland Cavaliers, until reach these Milestones.

On February 17, the Cavaliers completed a three-team trade with the Washington Wizards and the Los Angeles Clippers, acquiring Antawn Jamison from Washington and Sebastian Telfair from L.A. The Cavs sent Zydrunas Ilgauskas to the Wizards, plus a first round draft pick in 2010 and the rights to Emir Preldžić.

On March 23, the Cavaliers re-signed Zydrunas Ilgauskas for the remainder of the season after his contract was bought out by the Washington Wizards. The Cavaliers also waived Darnell Jackson to make room on the roster.

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