MIAMI — Doc Rivers knows better than probably any other coach about the dilemma of defending against Ray Allen. After five years of coaching Allen with the Celtics, Rivers is preparing his team to guard Allen as a member of the Miami Heat in Tuesday night’s season opener.

“I think Ray Allen is going to get shots, just like he got them with us, because he’s playing with great players,” Rivers said before practice Monday. “He’ll just stand somewhere, all by himself, and either you help or you don’t. If you don’t, LeBron [James] gets a dunk or [Dwyane] Wade gets a layup. If you do, Ray gets a jump shot. No different than when he was with us — [Rajon] Rondo drove, Paul [Pierce] got to the paint, they had to double-team Kevin [Garnett]. Ray benefited from that and he’ll do the same thing here, maybe even moreso here.”