Tennis Australia has whittled down its media review shortlist to two agencies - Zenith and PHD, AdNews understands.
The original shortlist had involved incumbent Vizeum and GroupM's Maxus, but it is now down to the final set, with Zenith and PHD battling it out for media buying and planning duties.
Tennis Australia is on track to reach annual revenue of $300 million in its 2015/16 financial year, making it the fourth largest sports administrator in earnings behind AFL, NRL and Cricket Australia.
In the past 12 months it spent $3.2 million on media, according to Nielsen figures.
Tennis Australia hosts one of Australia's premier sports properties - the Australian Open, which is the largest annual broadcast sports event in the southern hemisphere.
Each year the open grows in size with more sponsors and support events in and around Melbourne's tennis park.
This year there were 30 sponsors, including major partner KIA, associate sponsors ANZ and Jacob's Creek, as well as new partners such as Guvera, Titan Water, Blackmores and William Hill - the first time a betting shop has come on board.
Other tournaments under Tennis Australia includes the Hopman Cup, the Sydney International, Brisbane International, the Hobart International, World Tennis Challenge and the new FAST 4 Tennis tournament.
Vizeum won the AFL account from MediaCom earlier this year.
All agencies AdNews contacted and Tennis Australia declined to comment.
Have something to say on this? Share your views in the comments section below. Or if you have a news story or tip-off, drop us a line at email@example.com