 On January 18, 2014, Harris made his season debut and scored six points in 17 minutes off the bench in the Mavericks' 127–111 loss to the Portland Trail Blazers.He played well off the bench for the Mavericks over the second half of the 2013–14 season, scoring a season-high 20 points on March 9 in a win over the Indiana Pacers.His play-off the bench during the Mavericks' first-round series loss to the San Antonio Spurs was impressive, scoring over 17 points in three of the series' seven games.