This series was the last sweep in the NBA Finals until 2018, where the losing team was once again the Cleveland Cavaliers.

Answer this question based on the passage: when was the last time someone got swept in the nba finals? Okie... think carefully first, then make a decision:
The relevant information is: This series was the last sweep in the NBA Finals until 2018, where the losing team was once again the Cleveland Cavaliers. So, the answer is 2018.