What happened: Marcus Smart agreed to a two-year, $13-million contract with the Houston Rockets that carries a player option for the second season. The 32-year-old guard declined his $5.4-million player option with the Los Angeles Lakers to reach free agency, and in Houston he reunites with head coach Ime Udoka, who coached him in Boston.

Why it matters: Smart's exit strips the Lakers of the perimeter stopper who guarded opponents' best scorers and let Marcus Smart free Luka Doncic, Austin Reaves and LeBron James to run the offense. He is the third unrestricted free agent from last season's conference-semifinal roster to walk, joining James, who told the Lakers he would not return, and Luke Kennard, who signed with the Phoenix Suns. His steadying influence, notably on center Deandre Ayton, now shifts to a Houston team the Lakers eliminated in the first round last spring.

What to watch: Watch how Houston deploys Smart alongside its existing backcourt under Udoka, and how the Lakers replace his defense after also losing James and Kennard in the opening days of free agency.