Celtics' Al Horford: Starting sans Porzingis

Horford will enter the starting lineup for Wednesday's Game 5 against the Heat.

Horford played 34 minutes in Game 4 with Kristaps Porzingis (calf) going down with an injury in the first half. With Porzingis sidelined Wednesday -- and likely longer -- Horford will step into the starting center role, where he's expected to remain until Porzingis returns.