We're finally down to the NBA's Final Four.

With the Boston Celtics defeating the Milwaukee Bucks and the Dallas Mavericks shocking the world with a 33-point win over the Suns in Phoenix, both have moved on to the conference finals.

Here's how the final two matchups stand:

  • Eastern Conference Finals: (2) Boston Celtics vs. (1) Miami Heat
  • Western Conference Finals: (4) Dallas Mavericks vs. (3) Golden State Warriors

While much of the attention will be paid to superstars such as Stephen Curry, Luka Doncic, Jayson Tatum, Jimmy Butler and others, there are a number of X-factors who can swing a series as well.

Here's what to watch for in both series, including role players, lineups, injuries and defensive strategies that could make the difference between going to the NBA Finals or going home.

 

Boston Celtics vs. Miami Heat X-Factors

Grant Williams

Filling in as a starter for the injured Robert Williams III during the final four contests of the Milwaukee Bucks series, Grant Williams exploded for a game-high 27 points in Game 7 after totaling just 11 in his other three starts.

The 27 points were a career high, regular or postseason, and were a total we likely won't see again. That doesn't mean Williams can't swing another game in this series, however, as even his presence as an outside shooting threat can do wonders for Boston's offense.

Putting Williams and Al Horford on the floor together means making Bam Adebayo leave the paint and help open up driving lanes for Tatum, Jaylen Brown and others.