The son of former Australia great Michael Lynagh was born in Italy and his try, along with scores from centre Ignacio Brex and replacement halfback Stephen Varney, helped Italy come from 22-16 down at halftime and underline their improvement under new coach Gonzalo Quesada.
Scotland were dominant in the opening half hour, scoring tries through props Zander Fagerson and Pierre Schoeman, and winger Kyle Steyn, but they made numerous errors and could only manage a late try from lock Sam Skinner in the remainder of the game.
Italy forced that pressure with a heroic display as they claimed a first win over Scotland since 2015, and made up to a degree for their 13-13 draw with France last time out when flyhalf Paolo Garbisi missed a kick at the end of the game to win it.
Italy claimed a first Six Nations victory since they won in Wales in the final game of the 2022 tournament and it was their first at home for 11 years.
⌚� Is there a better time to score a try for your country than on your international debut and on Italy's first — Guinness Men's Six Nations (@SixNationsRugby) #GuinnessM6N win at home in 11 years? 🤩#Breitling #DefiningMoment @Breitling pic.twitter.com/IMNXQ1tuNCMarch 9, 2024
Garbisi had an early penalty chance and, in a carbon copy of his heart-breaking miss against France, almost ran out of time, again before slotting it over with a wry smile on his face.
Again the ball fell off the tee and Scotland players had to be warned not to charge the kick. Garbisi converted with under 10 seconds remaining on the shot clock.
From there, Scotland took control and put together 18 phases before Ferguson powered over and Steyn crossed following more adventurous rugby with ball in hand.
Italy needed a response and got it with a superb score.
Halfback Martin Page-Relo clipped a perfectly-weighted kick behind the defence and Brex was able to gather and go in under the posts.
Scotland grabbed a third try as a brilliant 50-22 from flyhalf Finn Russell set up an attacking lineout and Schoeman powered over.
Russell failed with the conversion, his first miss in this year's Six Nations, and one that proved crucial in the final result.
A long-range penalty from Page-Relo kept Italy in the contest as Scotland led 22-16 at halftime following a breathless first 40 minutes, but the momentum had swung in their favour.
Garbisi's superb grubber early in the second half was perfect for Lynagh to gather and score.
It was a sweet moment for 23-year-old English-based Lynagh, who has an Italian mother and who could have chosen to make his international career with Australia, England or the Azzurri.
Then, roared on by a sell-out crowd at the Stadio Olimpico, Italy hit the front when Varney crossed the tryline.
Scotland managed to earn a four-try and losing bonus points thanks to Skinner's late score.
