Oklahoma City led the Western Conference by beating Miami, where Butler was injured early during the game.
Oklahoma City won the away game against Miami 104-97.
Oklahoma City had a chase-and-go chase with Miami in the final quarter, when Williams drove in 13 points to lead the team to victory.
Cleveland also continued to lead the Eastern Conference by beating cup winners Milwaukee 124-101.
Mitchell led the team's offense with 27 points, four rebounds and six assists, including three 3-pointers.
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