His downward header from Liam Craig's corner in the 122nd minute at Ibrox may well have been heading into the net before it was knocked home by team mate Chris Kane, the final touch robbing the Saints stopper of a place in the history books as one of a select few goalkeepers to have scored a goal in a senior match.
Remarkably, had Clark’s header gone straight in, he would not have been the first St Johnstone goalkeeper to have achieved such a feat in recent times, with Matt Glennon finding the net for the Perth side in similar circumstances back in 2010.
Scottish football has examples of goalkeepers who have scored after coming up for corners, from the penalty spot, or from huge kick-outs that have bounced into the opposition net. One goalkeeper even managed to find the net after being played outfield from the start!
Here are a selection of goalkeepers who achieved what Clark so nearly did at Ibrox on Sunday.
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. 09/08/14 SCOTTISH CHAMPIONSHIP HIBERNIAN V LIVINGSTON EASTER ROAD - EDINBURGH Hibernian keeper Mark Oxley (left) celebrates his goal with team-mate Jordan Forster.
Hibernian goalkeeper Mark Oxley (left) celebrates his goal with team-mate Jordan Forster. Photo: SNS Group Rob Casey
. Matt Glennon
Had Zander Clark's header gone straight into the Rangers net, then he would have become the St Johnstone keeper to score from a corner, with Glennon having volleyed home a last-minute equaliser in a 2-2 draw at Ross County in 2010. Photo: Stuart Franklin
. Hamish McAlpine
Scored four goals in his career, more than any other keeper in the history of Scottish football, three for Dundee United from the penalty spot, and one for Raith Rovers from his own penalty box. Photo: SNS Group 0141 221 3602
9. Mark Oxley
Scored with a clearance on his league debut for Hibs in a 2-1 win against Livingston on 9 August 2014, to become the first goalkeeper to score for the Easter Road side since Andy Goram netted against Morton in 1988 Photo: SNS Group Rob Casey
10. George Wood
Former Everton, Arsenal, Crystal Palace and Scotland goalkeeper started his career at East Stirlingshire for whom he scored a goal from his own penalty area against Queen of the South on 9 January 1971 Photo: SNS Group 0141 221 3602
11. Zdenek Zlamal
This one didn't happen in Scotland, but worth mentioning as current Hearts goalkeeper became the first goalkeeper to score a non-penalty goal in the Czech league when he headed home a 92nd minute equaliser for Bohemians Praha 1905 against Dukla Praha in 2015. Photo: Ross Parker - SNS Group
12. Artur Boruc
The Polish goalkeeper didn't score from open play for Celtic but he did score a penalty in a marathon shoot-out against Dundee Utd in a League Cup semi-final. He'd previously scored from the spot for Legia Warsaw, celebrating by waving the corner flag above his head. Photo: SNS Group Steve Welsh