How on earth did the ball stay out? Rangers think they've taken the lead as Zander Clark brilliantly denies Daniel Candeias and Kyle Lafferty looks likely to have a tap in.

However, Lafferty's effort is parried by the Ninja-like reflexes of Clark on the line.

We're rubbing our eyes in disbelief here...

It remains 1-1 in Perth as we approach the final 15 minutes, not sure how that's still the case.

That Alfredo Morelos goal has changed the dynamic of the game. Rangers, with their tails up, are looking increasingly dangerous as the previously confident St Johnstone defence looks uncertain.

A long ball out of St Johnstone territory finds Matty Kennedy but Connor Goldson nabs the ball off the lone striker.

What's the old adage about a team being at its most vulnerable after scoring? Moments after restoring parity, Rangers are on the back foot as Matty Kennedy arrows a shot towards goal... beyond Allan McGregor but an inch wide of the far post.

That looked like a second for Kennedy and St Johnstone. Suddenly, this Premiership encounter in Perth is coming to the boil...

Rangers defender Connor Goldson is the latest name in referee Nick Walsh's black book for scything down Matty Kennedy.

St Johnstone keeper Zander Clark has yet to be seriously tested in the second half. Will the introduction of Kyle Lafferty change that?

Trying to capitalise on a defensive lapse by Rangers, David Wotherspoon attempts to thread the ball through to Murray Davidson but the pass it too heavy and the visitors survive.

Image source, PA

Allan Preston
BBC Scotland summariser at McDiarmid Park

Steven Gerrard shuffles his Rangers pack: Kyle Lafferty comes on for Lassana Coulibaly as the visitors seek an equaliser and a way back into this final Premiership fixture before Christmas.

Now it's Rangers' turn to rumble forward. Lee Wallace and James Tavernier trade crosses - both repelled by the St Johnstone defence - before Daniel Candeias spurns a good chance with a poor delivery into the box.

Seconds later, Liam Craig is booked for a late challenge on Connor Goldson.

What would St Johnstone give for a second goal? Scott Tanser whips in a cross from the left with Rangers eventually deal with as Allan McGregor gathers.

The sun appears to be giving the Rangers keeper a problem in the second half...

Rangers defender Connor Goldson does well to cut out a St Johnstone attack and launch the ball forward as the visitors seek an equaliser.

We're back under way in Perth.

Image source, BBC Sport

Matty Kennedy's festive cracker separates the sides at the break. As things stand, St Johnstone are on course for a first win over Rangers at McDiarmid Park since... March 2010.

A victory for Saints would lift them to fifth; a Rangers win would see them move up to second.

It's all to play for in Perth.

Image source, SNS

Allan Preston
BBC Scotland summariser

"It's half a job done so far [for St Johnstone]. Tommy Wright told us at the start what he was trying to do. Matty Kennedy will be up on his own and cause concern for the two centre halves.

"Kennedy has been magnificent. He's a lot smaller than the two of them [Rangers defenders] but he's ran them at the corners. Steven Gerrard has a job on his hands here."

Image source, SNS

Allan Preston
BBC Scotland summariser

St Johnstone midfielder Liam Craig is nursing a bloody nose after finding himself in a Rangers sandwich as he challenged for a high ball with Lassana Coulibaly and Connor Goldson.

Meanwhile, Lee Wallace replaces the injured Borna Barisic, to the applause of the away supporters.

This is Wallace's second Rangers appearance in 15 months...