Garnett and Rondo remained in second place at their positions behind the Heat duo in the third voting returns announced Thursday. Orlando center Dwight Howard is the other leader among Eastern Conference players.
Houston's Yao Ming has a huge lead at center despite being out for the season with a foot injury.
Boosted by the huge online vote total he receives from fans in his native China, Yao was voted as a starter the first seven years of his career, from 2003 to 2009. He was not on the ballot last season, when he was out for the year with an injury.
If an injured player is voted to start, commissioner David Stern chooses an injury replacement for the roster and the conference's coach tabs a reserve to start.
Starters will be announced Jan. 27.
Information from The Associated Press was used in this report.