The fluent former England opener faced 220 balls in the best batting conditions of a match which impressive Glamorgan largely dominated. He finished with 174
Headingley: 245 & 352-4d, Yorkshire 106 & 412-9
Adam Lyth's 174 led Yorkshire's brief dalliance with a final-day target of 492 - but they ultimately had to hold on by their fingernails for a draw.
Jonny Bairstow's nine-ball duck seemed to have ended any hopes Yorkshire had of reeling in the competition's second highest successful chase. But stand-in captain Lyth had other ideas.
The fluent former England opener faced 220 balls in the best batting conditions of a match which impressive Glamorgan largely dominated.
Yorkshire reached lunch at 99 for 1, with Bairstow elevated from No.5 to No.3 in only his second competitive innings since last August due to injury. After he edged Timm van der Gugten to second slip, Lyth led the hosts to a teatime score of 240 for 2 with 38 overs remaining.
Lyth shared 138 for the third wicket with George Hill, who made 60. After tea, the skipper was the first of two wickets in two balls for left-arm seamer Jamie McIlroy as Yorkshire fell to 326 for 6 with 17.3 overs left.
That later became 377 for 8 with eight left as James Harris struck twice in an over. But Yorkshire finished on 412 for 9 as Jordan Thompson, with 55, saw out the last over against Michael Neser nine wickets down.
Both counties remain winless after four rounds in Division Two.
Yorkshire batsman Adam Lyth [Getty Images]
After Bairstow edged to second slip just after lunch, Lyth and Hill increased the scoring rate.
Lyth cracked two sixes off Andrew Salter and Hill hit four fours of Labuschagne, also bowling off-spin, in the afternoon's final over to move to 59.
Rain wiped out the third day's evening session, meaning Yorkshire's second innings only started at the beginning of day four.
Paving the way for Bairstow's arrival, Finlay Bean had been trapped lbw by the impressive Timm van der Gugten for 21 with the last ball of the morning, the Dutchman's first of four for 72.
However, Bairstow edged an attempted drive at van der Gugten to Labuschagne at second slip - 105 for 2 in the 23rd over.
It was a case of one in and one out for Labuschagne, however. Shortly afterwards, he spilt a simple chance at second slip when the same bowler induced an edge from Lyth on 69.
Yorkshire would have been 110 for 3, and it was a key moment in a fixture which ultimately ended with the teams taking eight points apiece.
Lyth had hooked Neser for six on the way to a 70-ball morning fifty in the Headingley sunshine.
Neser took the new ball in the first innings and claimed seven wickets to skittle Yorkshire for 106.
It was, therefore, a surprise the Australian didn't grasp the new cherry again. He started the day stretching out his back at gully.
Bairstow's elevation was not the end of Yorkshire's batting order rejig.
Hill, who batted at No.8 in the first innings behind two nightwatchmen, was up to No.4 from his usual position of No.5. He came in ahead of international left-handers Saud Shakeel and Dawid Malan.
Glamorgan and Australia batsman Marnus Labuschagne [Getty Images]
Lyth breezed through the nineties to 99 with three fours off David Lloyd's seam in the 45th over as his side moved to 169 for 2. His 30th first-class hundred came early in the next over, off 135 balls with 17 fours and the aforementioned Neser six.
A second and third six followed quickly when he lofted and pulled Andrew Salter's off-spin, and the chase was starting to become a case of, 'They couldn't, could they?'
Hill taking four fours off Labuschagne increased the belief of the Headingley faithful. But they couldn't keep the momentum up.
Hill fell shortly after tea, caught behind, before James Harris trapped Malan lbw for 17 as the score fell to 281 for 4 in the 70th over.
Lyth reached 150 off 192 balls before being trapped lbw by McIlroy, who then got Dom Bess the same way for his second first ball duck of the match - a king pair.
Harris also got Shakeel caught at second slip for 35 and Matthew Fisher lbw in the 88th over, leaving Yorkshire 377 for 8.
Van der Gugten later bowled Mickey Edwards offering no shot at the end of the penultimate over. But Thompson held on.
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