Boston Celtics look to extend conference lead over Philadelphia 76ers

PHILADELPHIA – The Boston Celtics will face their final road test of the National Basketball Association regular season when they clash with another one of the Eastern Conference’s top teams in the Philadelphia 76ers on Tuesday night. Despite winning two straight, Boston (54-24) remain two games behind the Milwaukee Bucks for the top spot in the conference and the entire NBA. Extending the winning streak on Tuesday would give the Celtics a sweep of four head-to-head meetings with Philadelphia (51-27). The Celtics have been off since beating the Utah Jazz 122-114 on Friday, playing a night after their flight was…