On basketball After struggling, Rajon Rondo helped carry Celtics ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Mike Ehrmann/Getty Images Paul Pierce and the Celtics won Game 5 in Miami on Tuesday to take a 3-2 lead over the Heat in the East finals. Mike Ehrmann/Getty Images Pierce hit a key three-pointer over LeBron James with less than a minute left to help power the win. Jim Davis/Globe Staff Pierce's shot set off a celebration on the Celtics bench, as Boston took a lead in the series for the first time. Lynne Sladky/AP Dwyane Wade, right, and James will have to head back to Boston facing elimination in Game 6. Jim Davis/Globe Staff Chris Bosh returned to action for the Heat. He scored nine points in 14 minutes. Barry Chin/Globe Staff Rajon Rondo, shown being mugged here by Shane Battier, had 13 assists in 44 minutes for the Celtics. Jim Davis/Globe Staff Heat coach Erik Spoelstra saw his team lose its third straight game to the Celtics. Jim Davis/Globe Staff Doc Rivers and the Celtics moved within one win of a spot in the NBA Finals with the victory.