MIAMI — Welcome to Game 7.
It’s the seventh such Game 7 in the “Big Three plus Rondo” era. They are 4-2 in the previous six but of those six, only one came on the road. The 2010 Game 7 in the NBA finals  in which, like this series, the Celtics  were leading 3-2 but couldn’t close out in Game 6 when Kendrick Perkins  went down.
In losing Game 6 to LeBron James  and the Heat, the Celtics have put themselves in the position of fighting history.
There have been 110 Game 7s, and the home team is 88-22. The Celtics are 3-3, last winning on the road in 1974.
What’s even more improbable is a team winning both Game 5 and Game 7 on the road. The Celtics took a 3-2 series lead by winning in Miami last Tuesday. In the 110 seven-game series, only five times has the road team won both Games 5 and 7 – the 1968 and 1974 Celtics, the 1981 and 1995 Rockets and the 2005 Pacers all did the highly improbable.
On the Heat side, LeBron James is playing in his third Game 7 and everyone recalls the last one. He scored 45 points in a 98-91 loss to the Celtics at the Garden on May 18, 2008 in the Eastern semifinals. Before that, on May 21, 2006, James’ Cavaliers  also lost to the Pistons in the Eastern semis.
Ray Allen  will have more Game 7 experience than anyone on the floor Saturday night, playing in his ninth such contest. In addition to the six with the Celtics, he played in two with the Bucks in 2001, beating New Orleans in the Eastern semis before bowing out to Allen Iverson  and the Sixers in the Eastern finals in Philadelphia.