Singler was also named to the 2006 U18 USA Junior National team, alongside fellow top prospects Michael Beasley, Jerryd Bayless, and 2006 star recruit Spencer Hawes.

Singler is also one of eight players featured in Gunnin' for That#1 Spot, a 2008 documentary directed by Adam Yauch of the Beastie Boys which was filmed in 2006.

[2] In 2007, Singler led South Medford to its first-ever state basketball championship, winning 58–54 over defending champion Lake Oswego and national standout Kevin Love.

[3] A year earlier, Love and Lake Oswego had defeated Singler and South Medford for the state championship.

Singler was a member of the Legends AAU team, along with future UCLA player Kevin Love, and participated in many prestigious all-American camps, including the Nike All-American Camp (Indianapolis), the Nike Peach Jam (Augusta), and the Main Event (Las Vegas).

[8] Singler scored 19 points in the national championship game to reach 707 for the season, joining Scheyer (728) as the two became the second duo in Duke history to score over 700 points each in one season,[9] following in the footsteps of Jason Williams (841) and Shane Battier (778), who did so for Duke's 2001 national championship team.

"[13] Following the national championship, Singler considered entering the 2010 NBA draft,[14] but ultimately decided to return for his senior season at Duke.

Singler chose to join Real Madrid on November 30, 2011, after the two clubs agreed on a transfer fee.

[23] On February 19, 2015, Singler was traded to the Oklahoma City Thunder in a three-team deal that also involved the Utah Jazz.

[26] He began to receive more game time in mid-January, and on January 20 against the Charlotte Hornets, Singler scored a season-high 11 points and hit 3 of 3 from three-point range.

[27] The following season, on April 9, 2017, Singler scored 8 points, grabbed 4 rebounds, recorded 3 assists, and 3 steals, during Russell Westbrook's record-breaking 50-point triple-double game (Westbrook became the NBA's all-time leader in single season triple-doubles), a 106–105 win over the Denver Nuggets.

On September 30, 2018, Singler returned to Spain for a second stint, signing a one-year deal with Monbus Obradoiro.