Maddox played college basketball at Princeton. During the 2010–11 season in his senior year he led the team in blocks with 52, ranked third in the Ivy League in blocked shots at 1.7 per game, fourth in defensive rebounds at 5.0 per game, and fourth in overall rebounds at 6.9 per game, and averaged 14.0 points per game. He became the second Princeton player to have 50 blocks in a season, following Chris Young in 2001, since blocks began being kept as a stat. He had seven 20-point games and was the first Tiger since 1984 to have two 30-point games in a season. He led his team to the Ivy League championship and the NCAA tournament for the first time since 2004 where they were defeated by Kentucky team 59–57 on a layup by Brandon Knight at the buzzer. During the NCAA tournament, Maddox recorded 12 points, four rebounds, three steals and two assists.[1] Following the season he was named a unanimous first-team all-Ivy League and was named the Ivy League Defensive Player of the Year.[2] He finished his career with 822 points, 456 rebounds and 108 blocks in 104 games.[3]
Professional career
Landstede Hammers
Maddox played professionally for the Landstede Hammers of the Dutch Basketball League (DBL) during the 2011–12 season. He averaged 10 points, five rebounds and 1.6 blocked shots in 23 minutes per game, before suffering an injury in January which ended his season.[1]
Newcastle Eagles
On August 15, 2012, Maddox signed with the Newcastle Eagles of the British Basketball League (BBL) during the 2012–13 season.[1] He was named the Molten BBL Player of the Month for the month of November 2012. During the month he averaged a double-double of 16 points and 10.6 rebounds. He also ranked in the top ten in the BBL for steals with 2.0 per game, and ranked second for blocked shots with 1.8 per game.[4] He was again named the Molten BBL Player of the Month for the month of February 2013. During the month he averaged a double-double of 21.6 points and 13 rebounds per game. Defensively he recorded two blocked shots per game.[5] Following an outstanding season with the Eagles, he was named to Molten Team of the Year, and Molten Defensive Team of the Year.[6]