Rajon Pierre Rondo (born February 22, 1986) is an American professional basketball player who plays point guard for the Boston Celtics of the National Basketball Association (NBA). Born in Louisville, Kentucky, Rondo attended Eastern High School and Oak Hill Academy for his high-school basketball career, before receiving a scholarship from the University of Kentucky. He played for two years at Kentucky before declaring for the 2006 NBA Draft, represented by agent Bill Duffy.

During the draft, Rondo was selected 21st overall by the Phoenix Suns, and was subsequently traded to the Boston Celtics, where he made his NBA debut as a rookie during the 2006–07 season. He played a supporting role before he established himself as the starting point guard for the Celtics during the 2007–08 season. That season, Rondo earned his first NBA Championship, playing alongside All-Stars Kevin Garnett, Ray Allen and Paul Pierce. His breakout performance came during the 2009 NBA Playoffs, where he nearly averaged a triple-double, and helped his team take the eventual Eastern-conference champion Orlando Magic a full seven games in the East semi-finals.

In the first game of the 2010–11 season, Rondo put up 17 assists, which tied with Oscar Robertson for the third-most assists in a season opener. In the third game of the season, he dished out a career-high 24 assists along with a triple-double (10 points and 10 rebounds) against the New York Knicks. It tied him with Isiah Thomas as the only players in NBA history to have at least 24 assists in a triple-double. His total of 50 assists through the first three games of the season tied John Stockton's NBA record for most assists in the first 3 games of the season. In the next game against the Detroit Pistons, he finished the game with 17 assists for a total of 67 assists, which is the most assists in the teams first four games in NBA history.With a 15 assists effort the following day, Rondo again set a record for most assists through the first five games.Rondo's season also began with injuries. He has played through plantar fasciitis in his feet. He missed three games in November due to a strained left hamstring. He sprained his left ankle in a win against the New York Knicks on December 15, 2010, and missed the next seven games. On April 22, in the third game of the first-round playoff series against the New York Knicks, Rondo had a triple-double with 20 assists. Rondo set a Celtics franchise record for most assists in a playoff game. He was also tied with LeBron James with 6 career triple-double in the playoffs until James had reached his seventh further on in the playoffs during Game 4 of the Finals. Rondo had the third best selling jersey in the league during the 2010-11 season, behind only James and Kobe Bryant.