FINAL SCORE: Kade Stewart has become an unexpected after-siren hero with his goal landing the Hawks a four-point win.
He kicked the goal nearly 45 metres out, raising his arm as it sailed but before the final siren sounded.
Hawthorn outscored the Cats two goals to one in the last quarter that lasted just 22:27 after two of the first three quarter went past the 30-minute mark.
Geelong had hung onto a slender lead for the final 13 minutes of the term that never fluctuated past a goal.
Issac Smith had put the Hawks in front nearly eight minutes into the last quarter, but Aaron Black piled on his fourth goal to regain the lead for Geelong just two minutes later.
Final scores: Hawthorn 15.8.98 to Geelong 126.96.36.199.
THREE-QUARTER TIME: Geelong has slammed on nine goals in the third quarter to turn around a 41-point deficit into a five-point lead at the last change.
The Cats were unstoppable in the middle part of the term, kicking seven goals in 12 minutes.
Blicavs scored his second goal from a mark and his 45m shot after the siren gave geelong the lead again.
The Hawks did bounce back late in the term to score two goals.
Tom Hawkins had put the Cats in front when he almost accidentally ground kicked from the right pocket that went inward enough to not go over the boundary line, but find the goal line.
The score at three-quarter time: Geelong 188.8.131.52 to Hawthorn 13.4.82.
HALF-TIME: Hawthorn have kicked on further in a dynamic start to its preseason campaign.
The home side increased their lead from 19 at the first change to 41 points at the long break.
Hawthorn proved to be too smart around goal face for a rusty Cats defence.
The series of second-quarter goals were snapped under pressure within a short distance of the posts.
Even the longer kicks were parts of smart play, as Will Langford proved off a one-step start 45 metres out when a kick failed to go the distance for a mark.
The score at half-time: Hawthorn 0.11.3.69 to Geelong 184.108.40.206
QUARTER-TIME: Hawthorn have steamrolled out to a convincing 16-point lead at the first change of the preseason clash at University of Tasmania Stadium.
Geelong scored within the first 73 seconds through ruckman Mark Blicavs and were soon up two goals to nil.
But Hawthorn responded with an intensity usually reserved for the AFL season proper, driving home five consecutive goals inside just eight minutes.
Ben McEvoy marked uncontested, Cyril Rioli and Will Langford showed their usual smarts around goal, and when Ryan Schoenmakers and rookie Kade Stewart goaled exactly two minutes apart, the Hawks had turned a 11-point deficit into a 19-point advantage.
Only a super-goal from Andrew Mackie – one of only two Cats to have played an AFL match in Launceston – stemmed the bleeding as the Hawks took a 16-point lead into the first change.