The 1990–91 NBA season was the Mavericks' 11th season in the National Basketball Association. During the offseason, the Mavericks signed free agent and All-Star forward Alex English, while acquiring his teammate Fat Lever from the Denver Nuggets, and Rodney McCray from the Sacramento Kings. However, the Mavericks troubles would start early as Lever, and Roy Tarpley were both lost early in the season with season ending injuries. While on the injured list, Tarpley would again be suspended for substance abuse by the NBA. Despite winning four of their first five games, the Mavericks struggled and lost 10 of their next 13 games. Their struggles continued as they lost eight consecutive games near the end of the season, finishing sixth in the Midwest Division with a 28–54 record. Following the season, English retired.

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