Tatum, Horford guide Boston to 96-83 win, 3-2 edge in Eastern Conference finals.
Cleveland trails Eastern Conference finals, 2-1; Game 4 set for Monday.
Jaylen Brown scores 23 points for Boston.
Quick start paves way for 108-83 Boston win.
LeBron James finished with 29 points and 11 assists
Running one-hander caps 38-point performance in 105-103 win.
Big third quarter paves way for 128-110 Cleveland win.
James scores 45 points, is 13-0 in first round series in his career.
Oladipo posts triple-double as Indiana rolls, 121-87.
Cleveland can finish off Pacers with win Friday in Indiana.