Tassie 18.5 (113) defeated the Thunder 8.3 (51) in the first match of the 2005 carnival, staged at Optus Oval in chilly, but sunny conditions on Saturday.
The heroics of Grima, on top of Tasmania's deadly accuracy in front of goal, were crucial to the win, as the Apple Isle booted 11.1 to 5.7 in the first half, before running away with the victory.
The 18-year-old, 193cm tall key forward, from the Northern Bombers, was outstanding as he kicked three goals in the opening term - including the first two of the match. He then bagged another three in the second quarter to have six goals by the first half.
He then added a further four goals after the main break to hit doubles figures in one of the best individual efforts in the history of the under 18 tournament.
Grima's conversion was spot-on, kicking 10 goals straight from his 12 kicks, while he claimed nine marks - including six contested marks. His efforts will surely get the football pundits talking.
Mitchell Thorp (18 disposals and a goal), Cameron Beck (16 touches and two majors) and Darren Crawford (17 possessions and one goal) were other players to shine for Tasmania.
For the Territory, Trevor Oliver racked up 25 touches - the most for the match - to be among his side's best, while Nathan McLean notched up 20 kicks and took 11 marks. Bradley Stephensen was also a strong performer, with 22 disposals and 20 hit outs.
Tasmania controlled the match right from the start, when it slammed five goals to one, claiming a 23-point lead at the first change.
Although the Thunder fought back and reduced the margin to 11 points at the 17-minute mark of the second term, which included two from Matthew Campbell in this period, Tasmania answered strongly with four in a row before half time.
Tassie took a 35-point advantage into the long break and from that point onwards it never looked back.
A three quarter-time lead of 43 points was blown out to 10 goals in the final quarter, giving Tasmania one of its best results in recent years.
NORTHERN TERRITORY: 1.2 5.7 6.3 8.3 (51)
TASMANIA: 5.1 11.1 13.4 18.5 (113)
GOALS - Northern Territory: Campbell 2, Calma 2, G.McLean, Oliver, Rioli, Stephensen Tasmania: Grima 10, Beck 2, Fagan 2, Charlesworth, Crawford, Thorp, Wells
BEST - Northern Territory: Oliver, Stephensen, N.McLean, Campbell, Measures, Corrie Tasmania: Grima, Thorp, Beck, Crawford, Howard, Armstrong, Lonergan, Turner, Neville
UMPIRES - Fila, Keating, McDonald
At Optus Oval
