The Boston Celtics and the Miami Heat face off in Game 4 of the Eastern Conference Finals at 8:30 p.m. ET on Monday. Boston is favored by seven points at Caesars Sportsbook, while the Over-Under is set at 206 (see up-to-date odds for every game this week on our NBA odds page). 

Before making any Heat vs. Celtics picks, you NEED to check out the NBA predictions from SportsLine expert Zack Cimini.

A Las Vegas handicapper who's never afraid to buck conventional wisdom, Cimini excels in multiple sports. Over the past 30 NBA selections, Cimini is 21-11, returning almost $900 to $100 players. He is also on an amazing 34-16-1 run with his last 51 against-the-spread picks involving the Celtics, returning $1,548 to $100 players.

Cimini knows the Celtics bring an elite defense, leading the NBA in defensive efficiency in 2021-22. Boston's offense is in a groove in the playoffs, however, and that continues in this series. The Celtics are scoring more than 1.17 points per possession against the Heat, posting a 62.3 percent true shooting mark. Boston is assisting on almost 65 percent of field goals in the playoffs, and the Celtics are connecting on nearly 38 percent of 3-point offerings.

He also knows the Heat are flying around on defense. Miami forced 24 turnovers in Game 3, and the Heat are creating 15.9 turnovers per game in the playoffs. That includes 8.9 steals per game, and Miami is yielding only 1.07 points per possession. The Heat are very good on the glass, leading to an advantage in the possession battle, and Miami ranked in the top five of the NBA in defensive efficiency this season.

Now, Cimini has set his sights on Heat vs. Celtics. We can tell you he is leaning under the total, and he's isolated a critical x-factor that makes one side hit HARD! You ABSOLUTELY need to see what he has to say before locking in any NBA picks.

Who wins Heat vs. Celtics? And what critical x-factor makes one side hit hard? ... Join SportsLine right now to find out which side of the Heat vs. Celtics spread you should be all over Monday, all from the expert on a roll on NBA picks!