EXPERIENCED whistle-blower Ray Chamberlain will officiate his 20th final after getting the nod from the AFL umpiring department to adjudicate Friday night's do-or-die clash between Melbourne and Geelong.

Meanwhile, umpires Nathan Williamson and David Harris will make their finals debuts.



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At 24 years of age, Williamson is the youngest umpiring appointment in week one of the finals, and will officiate the elimination final clash between Sydney and Greater Western Sydney on Saturday at the SCG.

He made his debut last season in round one, and has umpired a total of 44 AFL games so far in his short career.

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He will be assisted by experienced duo, Dean Margetts and Matt Stevic who between them have adjudicated 39 finals.

Experienced finals campaigner Brett Rosebury will umpire his 41st final on Thursday night when Richmond and Hawthorn face off.

Last year, he umpired his 40th final, breaking the record for the most number of finals adjudicated.

The previous record of 39 was held by head AFL umpires coach Hayden Kennedy and Jack Elder, who was named as the VFL/AFL's umpire of the century in 1996.

Curtis Deboy will umpire his second final, while Shaun Ryan gets the nod for his 30th appearance in September.

Another experienced campaigner, Matt Nicholls, will officiate in his 79th straight game on Saturday night when West Coast hosts Collingwood at Optus Stadium.

First qualifying final: Richmond v Hawthorn

Field umpires: Brett Rosebury, Curtis Deboy, Shaun Ryan

First elimination final: Melbourne v Geelong

Field umpires: Ray Chamberlain, Robert Findlay, Jacob Mollison

Second elimination final: Sydney v Greater Western Sydney

Field umpires: Dean Margetts, Matt Stevic, Nathan Williamson

Second qualifying final: West Coast v Collingwood

Field umpires: Mathew Nicholls, Simon Meredith, David Harris