Dundee cruised past Morton into the Scottish Cup quarter-finals thanks to a lethal second-half performance.
The hosts took the lead through Jim McAlister before Michael Tidser poked the ball past Dundee keeper Rab Douglas from close range to equalise.
Lewis Toshney restored Dundee's lead in the second-half before Colin Nish's header extended their lead.
Two further goals, from John Baird and Declan Gallagher, completed the rout.
The home side pressed early on, forcing successive corners from McAlister; Baird's header from the second of these forcing a fine save from Morton keeper Derek Gaston.
Nicky Riley also tested Gaston early on, with a drive which fizzed narrowly wide.
Baird then went close again, picking up on a flick-on from Nish and rifling in an effort from a tight angle which hit the side netting.
Morton were handed an opportunity when Iain Davidson was adjudged to have handled 25 yards from goal.
Martin Hardie's free-kick brought out a great save from veteran keeper Douglas low at his near post.
Dundee finally got the breakthrough as Colin Nish headed a long ball down into the path of the onrushing McAlister, and he calmly slotted the ball left-footed past Gaston.
The Dens Park side's lead lasted barely a minute, however, as Tidser picked up on a loose ball which had ricocheted around the Dundee six-yard box and poked past the despairing Douglas.
However, the home side were still controlling the play, and pinball in the Morton box led to the ball falling to Baird just outside the six-yard box, but the 27-year-old couldn't keep his effort on target.
The Greenock side began the second half in a more enterprising fashion, with striker Peter MacDonald being supplied the ball more often, although unable to set up a teammate.
But it was Dundee who took control of the match, with a burst of three goals in quick succession to put the match beyond Morton.
First, Lewis Toshney headed the ball into the net at the near post from a McAlister corner to put Dundee back ahead.
Colin Nish then headed home at the back post after the lively Nicky Riley volleyed the ball across the face of goal.
John Baird volleyed the ball past Gaston from the edge of the box after picking up on a headed clearance to give Dundee a three-goal cushion.
Morton had not given up however, and Douglas pulled off a great save to tip a left-footed volley from Michael Tidser over the bar.
But young defender Gallagher killed off any faint hopes the Ton had when he rose at the back post to head the ball past Gaston.
Substitute Steven Milne should have made it six for the Dens Park side, but twice his efforts from a couple of yards out were scrambled off the line, before the Morton defence could clear the ball.
Full Time The final whistle goes and the game is over.
The referee blows for offside. Free kick taken by Rab Douglas.
Substitution Kevin McBride goes off and Ryan Conroy comes on.
Substitution Mark Stewart is brought on as a substitute for John Baird.
Inswinging corner taken from the left by-line by James McAlister, clearance made by Kyle Wilkie. Shot from 18 yards by Lewis Toshney. Save by Derek Gaston.
Centre by Nicky Riley.
The offside flag is raised against Kyle Wilkie. Rab Douglas takes the indirect free kick.
Assist by James McAlister.
81:27 Goal scored
Goal! - Declan Gallagher - Dundee 5 - 1 Morton Declan Gallagher grabs a headed goal from close in. Dundee 5-1 Morton.
Foul by Kevin Rutkiewicz on Declan Gallagher, free kick awarded. James McAlister delivers the ball,
Handball by William Dyer. Gary Irvine takes the direct free kick.
Free kick taken by Declan Gallagher.
Substitution Steven Milne on for Colin Nish.
Fouad Bachirou gives away a free kick for an unfair challenge on Iain Davidson.
Corner taken left-footed by Michael Tidser from the left by-line, clearance made by Declan Gallagher.
Michael Tidser takes a shot. Save by Rab Douglas.
Peter Weatherson fouled by Iain Davidson, the ref awards a free kick. Michael Tidser takes the free kick.
The offside flag is raised against David O'Brien. Rab Douglas takes the free kick.
Assist on the goal came from Colin Nish.
73:49 Goal scored
Goal! - John Baird - Dundee 4 - 1 Morton John Baird grabs a goal from inside the box to the bottom left corner of the goal. Dundee 4-1 Morton.
Foul by William Dyer on Nicky Riley, free kick awarded. Kevin McBride takes the free kick.
John Baird takes a long range shot clearing the bar.
Substitution Kyle Wilkie joins the action as a substitute, replacing Martin Hardie.
Substitution Peter Weatherson replaces David Graham.
The assist for the goal came from Nicky Riley.
70:08 Goal scored
Goal! - Colin Nish - Dundee 3 - 1 Morton Colin Nish finds the net with a headed goal from inside the six-yard box. Dundee 3-1 Morton.
Free kick awarded for an unfair challenge on Peter MacDonald by Gary Irvine. Michael Tidser crosses the ball from the free kick left-footed from left wing, Colin Nish manages to make a clearance.
Inswinging corner taken by Michael Tidser from the right by-line played to the near post. Corner taken by Michael Tidser from the right by-line to the near post. Peter MacDonald produces a overhead kick right-footed shot from deep inside the penalty area which goes wide of the right-hand post.
James McAlister provided the assist for the goal.
64:11 Goal scored
Goal! - Lewis Toshney - Dundee 2 - 1 Morton Lewis Toshney finds the net with a headed goal from close range. Dundee 2-1 Morton.
Corner taken by James McAlister from the left by-line,
Nicky Riley produces a cross, Martin Hardie makes a clearance.
David Graham has an effort at goal from just outside the area which goes wide of the left-hand post. Michael Tidser takes a outswinging corner to the near post, Rab Douglas makes a save.
Gary Irvine challenges David O'Brien unfairly and gives away a free kick. Direct free kick taken by David O'Brien.
James McAlister takes a shot. Save made by Derek Gaston.
Centre by Scott Taggart, clearance made by Iain Davidson.
The referee penalises Colin Nish for handball. Indirect free kick taken by Derek Gaston.
The ball is swung over by James McAlister, clearance made by Kevin Rutkiewicz.
The ball is crossed by Gary Irvine.
Martin Hardie concedes a free kick for a foul on Kevin McBride. Brian Easton takes the direct free kick.
William Dyer sends in a cross, clearance by Iain Davidson.
The ball is sent over by Brian Easton, save by Derek Gaston.
The referee blows his whistle to start the second half.
45:00 +1:24 Half time
Half Time The whistle is blown to end the first half.
Effort from inside the area by John Baird misses to the right of the target.
Effort on goal by Martin Hardie from long range goes harmlessly over the bar.
Peter MacDonald gives away a free kick for an unfair challenge on Lewis Toshney. Free kick taken by Kevin McBride.
Brian Easton produces a cross.
Nicky Riley sends in a cross, clearance made by Kevin Rutkiewicz.
Inswinging corner taken by Michael Tidser, Declan Gallagher manages to make a clearance.
The ball is sent over by Peter MacDonald, Gary Irvine gets a block in.
The ball is sent over by David Graham.
The ball is crossed by Peter MacDonald.
Scott Taggart gives away a free kick for an unfair challenge on Nicky Riley. Kevin McBride restarts play with the free kick.
Gary Irvine takes a shot from just outside the penalty area clears the crossbar.
Free kick awarded for an unfair challenge on John Baird by William Dyer. Kevin McBride takes the free kick.
Outswinging corner taken from the right by-line by James McAlister, Derek Gaston fouled by Declan Gallagher, the ref awards a free kick. Derek Gaston restarts play with the free kick.
Free kick awarded for a foul by Colin Nish on Kevin Rutkiewicz. Direct free kick taken by Derek Gaston.
Assist on the goal came from Peter MacDonald.
30:30 Goal scored
Goal! - Michael Tidser - Dundee 1 - 1 Morton Goal scored by Michael Tidser from inside the box to the bottom left corner of the goal. Dundee 1-1 Morton.
Nicky Riley has a drilled shot. Save made by Derek Gaston.
Assist by Colin Nish.
28:21 Goal scored
Goal! - James McAlister - Dundee 1 - 0 Morton A goal is scored by James McAlister from inside the area to the bottom left corner of the goal. Dundee 1-0 Morton.
Nicky Riley crosses the ball, Shot from close in by Colin Nish misses to the left of the goal.
Inswinging corner taken right-footed by David Graham from the left by-line, Rab Douglas makes a save.
The referee penalises Iain Davidson for handball. Martin Hardie produces a shot on goal direct from the free kick, save made by Rab Douglas.
William Dyer delivers the ball, Declan Gallagher makes a clearance.
The ball is swung over by David O'Brien, Gary Irvine gets a block in.
John Baird produces a right-footed shot from deep inside the penalty box which goes wide of the right-hand upright.
Peter MacDonald crosses the ball.
James McAlister gives away a free kick for an unfair challenge on David Graham. Direct free kick taken by Martin Hardie.
Free kick awarded for a foul by Martin Hardie on Iain Davidson. Direct free kick taken by Lewis Toshney.
Centre by Scott Taggart.
Michael Tidser takes a inswinging corner from the right by-line played to the near post, Colin Nish makes a clearance.
Nicky Riley produces a right-footed shot from outside the box and misses left.
Brian Easton is caught offside. Derek Gaston takes the indirect free kick.
The assistant referee signals for offside against David Graham. Rab Douglas takes the free kick.
The ball is crossed by David O'Brien.
The ball is sent over by Brian Easton, Craig Reid makes a clearance.
Corner taken by James McAlister from the right by-line to the near post, John Baird takes a shot. Save by Derek Gaston.
Outswinging corner taken from the right by-line by James McAlister, clearance by Kevin Rutkiewicz.
Nicky Riley delivers the ball, clearance by Scott Taggart.
Scott Taggart produces a cross, save by Rab Douglas.
Iain Davidson produces a left-footed shot from just outside the area that goes harmlessly over the bar.
The ball is swung over by William Dyer, comfortable save by Rab Douglas.
The ball is swung over by Brian Easton, Craig Reid fouled by Colin Nish, the ref awards a free kick. Derek Gaston takes the direct free kick.
Unfair challenge on John Baird by Martin Hardie results in a free kick. Declan Gallagher takes the direct free kick.
William Dyer produces a cross, clearance by Lewis Toshney.
The referee gives a free kick against Colin Nish for handball. Michael Tidser takes the indirect free kick.
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