<Tr> <Th> Most recent champion (s) </Th> <Td> Orlando: Dallas Mavericks Las Vegas: Los Angeles Lakers </Td> </Tr> <Tr> <Th> TV partner (s) </Th> <Td> NBA TV and ESPN </Td> </Tr> <P> The NBA Summer League is a series of off - season competitions during which National Basketball Association teams come together to try out different summer rosters instead of their regular season line - ups . The summer teams typically consist of a mix of rookies, second year players, and unsigned free agents . The current summer league consists of three separate leagues: the Las Vegas Summer League, the Utah Jazz Summer League, and the Orlando Pro Summer League . </P> <P> Summer leagues have existed for decades . Historically, there was not an organized structure, with leagues sometimes overlapping and not officially coordinated . In 2004, the league held the Las Vegas Summer League for the first time; it is by far the largest league, with 24 teams participating as of 2017 . The Orlando Pro Summer League has been held since 2001 . The Utah Jazz Summer League began play in 2015, replacing the Rocky Mountain Revue, an event held from 1984--2008 before going on a lengthy hiatus due to declining participation . </P>

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