Jimmy Butler issues fiery warning to NBA rivals after Miami Heat's poor start to season

Miami Heat have started the NBA season poorly, but Jimmy Butler is not worried. He believes his team will win the championship despite their poor form. The Heat lost to the Sacramento Kings on Saturday. They have 75 games to play. They were beaten in the Eastern Conference finals by the Celtics five months ago. Butler believes the team is going to improve. There have been changes to their team, including the departure of PJ Tucker and the arrival of Tyler Herro. Miami Heat are 2-5.