Bradley was selected with the 19th overall pick in the 2010 NBA draft by the Boston Celtics.
On July 2, 2010, he signed his rookie scale contract with the Celtics.
The same day, he underwent successful ankle surgery and subsequently missed the 2010 NBA Summer League.

Still just 19 years old, Bradley joined a Celtics team that was one of the best in the Eastern Conference.
He did not see his first regular season action until the fourteenth game of the season, a 23-point win over the Atlanta Hawks in which Bradley scored two points and committed two turnovers.
On January 14, 2011, Bradley was assigned to the Maine Red Claws of the NBA Development League and on the same day made his debut game for the team, playing 21 minutes and scoring 11 points.
Following a spinal cord injury to Marquis Daniels during a game against the Orlando Magic on February 6, 2011, Bradley was recalled by the Boston Celtics on February 7, and joined the team for the game against the Charlotte Bobcats.

In the one Celtics game of Bradley's rookie season in which he played more than 15 minutes, Bradley scored 20 points to go with three rebounds, two assists and two steals.
However, he played ten or more minutes in just two other NBA games and did not appear in any of the Celtics' postseason contests.
On June 30, 2011, the Celtics exercised their third-year team option on Bradley's rookie scale contract, extending the contract through the 2012–13 season.
Bradley was selected with the 19th overall pick in the 2010 NBA draft by the Boston Celtics. On July 2, 2010, he signed his rookie scale contract with the Celtics. The same day, he underwent successful ankle surgery and subsequently missed the 2010 NBA Summer League.
Still just 19 years old, Bradley joined a Celtics team that was one of the best in the Eastern Conference. He did not see his first regular season action until the fourteenth game of the season, a 23-point win over the Atlanta Hawks in which Bradley scored two points and committed two turnovers. On January 14, 2011, Bradley was assigned to the Maine Red Claws of the NBA Development League and on the same day made his debut game for the team, playing 21 minutes and scoring 11 points. Following a spinal cord injury to Marquis Daniels during a game against the Orlando Magic on February 6, 2011, Bradley was recalled by the Boston Celtics on February 7, and joined the team for the game against the Charlotte Bobcats.
In the one Celtics game of Bradley's rookie season in which he played more than 15 minutes, Bradley scored 20 points to go with three rebounds, two assists and two steals. However, he played ten or more minutes in just two other NBA games and did not appear in any of the Celtics' postseason contests. On June 30, 2011, the Celtics exercised their third-year team option on Bradley's rookie scale contract, extending the contract through the 2012–13 season.
Avery Bradley