Versatile point guard who helped lead the Boston Celtics to an NBA Championship in 2008; he was selected to his first NBA All-Star game in 2010. During the 2014-15 NBA season, he was traded from the Celtics to the Dallas Mavericks. He then spent time with the Kings and Bulls before signing with the New Orleans Pelicans in 2017.
He played two seasons at the University of Kentucky, but left the school before his junior season to enter the 2006 NBA Draft.
He was drafted 21st overall by the Phoenix Suns, but was traded away to the Celtics, along with forward Brian Grant, in exchange for a 2007 first round pick. He led the NBA in steals in 2010 and assists in 2012.
He married Ashley Bachelor, whom he began dating during his time at Kentucky. Together they had a daughter named Ryelle and a son named Rajon, Jr.
He and Kevin Garnett helped bring an NBA Championship to the city of Boston in 2008.