Goals either side of half-time from Andy Ryan and Cian Bolger sealed a 2-0 win over Glentoran at the Oval.
Ryan struck from the penalty spot after Jordan McEneff had been fouled, while the home side missed a spot kick of tbeir own before the half-time break.
Captain Bolger then scored from close range after Joe Thomson kept a Sean Graham corner alive to double Larne’s lead in the second half.
Dylan Sloan and James Singleton then saw red in the closing stages as both sides finished with 10 men.
