During his sophomore season in Christ the King High school in New York in 2006, Walker was named to the 2006 1st annual Boost Mobile Elite24.
Erving played basketball for the Florida gators basketball team from 2008-2012 as a point guard wearing number 11. He was named to the 2012 All-SEC Second team during his senior season. He is still the holds the all-time leading assists record at Florida (547) and is still the fourth scoring leader (1,777 points).
During his senior season the gators lost to Louisville in the Elite Eight of the NCAA Tournament
Walker averaged 12.1 points, 4.7 assists and 2.8 rebounds in his senior year at Florida
In 2012, "Walker was charged with petit theft and resisting an officer without violence at 1 a.m. ET March 30 after Gainesville Police Department officers apprehended him following a foot chase that also involved several police cars." "Judge Walter M. Green withheld adjudication and ordered Walker to pay the fine by Sept. 27. The state dropped an additional misdemeanor charge of resisting arrest without violence as part of the agreement."
After going undrafted in the 2012 NBA draft, he signed with Prima Veroli of the Italian Second Division in the summer of 2012. He played 20 games, averaging 17.9 points and 3.6 assists per game.
In October 2013, after passing a tryout period, he signed a one-year deal with Stelmet Zielona Góra. He parted ways with them on January 28, 2014. On February 5, 2014, he signed with Élan Chalon for the rest of the 2013–14 season.
On June 23, 2014, he signed with JDA Dijon Basket for the 2014–15 season. Over 37 French League games played, he averaged 17.6 points, 6.1 assists and 3.1 rebounds per game on 41% shooting from the field. However, Dijon finished in 10th place not being able to make playoffs.
On July 8, 2015, he signed a one-year contract with Büyükçekmece Basketbol of the Turkish Basketball Super League.
On July 25, 2016, Walker signed with SIG Strasbourg for the 2016–17 season.
On June 27, 2017, Walker returned to Büyükçekmece Basketbol for the 2017–18 season.
Note: The EuroLeague is not the only competition in which the player participated for the team during the season. He also played in domestic competition, and regional competition if applicable.
Erving has recently featured in a YouTube series on Grit Media in a series called deployed. This also features other basketball players including Romeo Travis and Josh Childress