Maybe the Championship side are starting to tire because Rangers are finding gaps with regularity now. Barrie McKay takes aim for the near post with a firm drive from a tight angle and Derek Gaston does well to keep it out.
- FT: Rangers 2-1 Greenock Morton (Miller, Waghorn; Tidser)
- Alex McLeish on Ibrox vacancy: "I am a Rangers man"
- FT: Hearts 0-0 Hibernian
- Edinburgh rivals will replay cup tie on 22 Feb
Morton are creaking as Martyn Waghorn finds more room behind the visiting defence and draws a good save from Derek Gaston with a firm strike.
Michael O'Halloran comes off the home bench to replace Jason Holt.
Rangers have been lifted by that goal as James Tavernier powers a shot straight at Derek Gaston and Phillipe Senderos sends a header inches wide from a corner.
Morton are looking a bit shaky at the back now.
Martyn Waghorn is on hand to ram the ball in from close range as Jason Holt works the ball into the penalty area and Emerson Hyndman does well to knock the ball across the face of goal from the near post area.
Battle of the baldies... Phillipe Senderos gives Jim Duffy a shove as he gathers the ball from in front of the tunnel. No need for that. Just as well the Morton manager doesn't have his boots on.
Rangers forward Martyn Waghorn gathers a long ball over the top and spins well to fire an angled shot narrowly wide of the far post.
Great chance for Morton as Phillipe Senderos makes a horrible mess of a defensive header. Michael Tidser quickly lays the ball off for Aidan Nesbitt, who only has the keeper to beat from the edge of the box but he crashes a panicked shot high over the crossbar.
Yet another poor Morton free kick. The worst of the lot, as Ross Forbes swings the ball straight out of play with all the big men up from the back.
Andy Halliday and Jamie Lindsay thunder into a full-blooded challenge and it's the Morton man who comes off worse. He hobbles off for some treatment, while the Rangers midfielder is up and about already.
Here we go again for the second half.
That equaliser from Kenny Miller was the veteran striker's ninth goal of the season.Copyright: SNS
Former Rangers midfielder Derek Ferguson on BBC Sportsound:
"I expected Rangers to come flying out of the traps but that didn't happen. They are over-playing too often and that allows Morton to get back into their defensive shape. They need to get one-on-one in wide areas and deliver the ball quicker."
Morton got off to a great start thanks to Michael Tidser's opener from 20 yards but Rangers didn't waste much time finding an equaliser through Kenny Miller.
The home side have been on top since, although they have not created too many clear-cut chances.
Ross Forbes tries to catch Wes Foderingham out by taking aim at the near post with a long-range free kick. There's not enough pace on it to trouble the Rangers keeper.
We'll get two minutes of stoppage time.
Barrie McKay is burning past Morton players on Rangers' left flank. He's the go to ball for the home side. Jamie McDonagh is blowing hard and he's just on...
Kenny Miller thinks he's earned a spot-kick as Lee Kilday barges him over but referee Andrew Dallas just shakes his head. The Morton defender is a bit lucky to get away with that clumsy challenge.
Jamie McDonagh, middle name Cantona, is on for Morton as Michael O'Doyle is unable to shake off that earlier leg injury.
Barrie McKay is the most dangerous outlet for Rangers and he plays a great ball across the face of goal. A stretching Jason Holt is not far away.
Michael Doyle slides in to win a great tackle on Barrie McKay but the Morton man is hurt in the process. he should be fine as he hobbles to sideline. 'Run it off, son,' is the message from the away dug out.