Crusaders 0-1 Linfield
Mark McAllister scored the only goal of the game at Seaview to maintain Linfield's four-point lead at the top of the Premiership.
McAllister tapped in from close range for his 14th goal of the season in the 27th minute after Sean O'Neill had palmed away a Philip Lowry shot.
Gareth McKeown fired wide late on for the Crues and Colin Coates was sent-off for a second yellow card offence on 90.
The Crues drop a place to sixth in the league table.