Aussie viewers have reacted angrily to Channel 9’s $350 million Australian Open experiment.

Social media was littered on the opening day of the year’s first grand slam with scathing criticism of Nine’s first day of covering the two-week spectacle at Melbourne Park.

The network last year secured the Australian Open in a $300 million six-year deal as part of the greatest shake-up to Australian television’s summer sport landscape.

Nine went on to secure the rights to the 2019 Australian Open in August in a deal worth an additional $48.5 million following revelations of scheduling conflicts between former broadcaster Channel 7’s coverage of the 2019 event and its new cricket broadcast project with Fox Sports.

Nine spared no expense in assembling a high-profile commentary team to match its financial investment — headlined by the headhunting of American Jim Courier and Aussie fan-favourite Todd Woodbridge from Seven’s stable.

Unfortunately, in the eyes of many, the coverage has fallen flat.

Aussie fans flocked to Twitter on Monday, punching holes in Nine’s opening day broadcast from Melbourne Park.

The tennis identities assembled by Nine, including hosts Erin Molan and Tony Jones, were again a source of aggravation for many Aussie viewers, but the greatest cause for concern for many was the many unfamiliar voices behind the microphone after more than 40 years of Seven broadcasting the Aussie Open.

Nine’s star-studded commentary stable was among the broadcast services used by the Australian Open’s Host Broadcast Service — sent to more than 900 million potential viewers around the world.

However, the decision to use international commentators, including those from the HBS feed, during the opening day rubbed many fans raw.

Day one coverage prominently featured popular Aussie caller Peter Donegan’s tag-team commentary with South African great Wayne Ferreira during World No. 2 Rafael Nadal’s win over Aussie James Duckworth — the second match on Rod Laver Arena.

Nine followed that match with its pairing of Woodbridge and Courier for Alex de Minaur’s first-round match against Pedro Souza.

The star-studded pairing of Jelena Dokic and John Fitzgerald covered Maria Sharapova’s 6-0 6-0 win over Harriet Dart in the first televised match of the day.

Viewers on social media appeared to be unimpressed at the standard of commentary.

.@Channel9's coverage of #AusOpen feels so disjointed and amateurish because they're taking the world feed - clearly couldn't be bothered to do their own domestic feed like @Channel7 used too. — Perrin Brown (@PerrinPezzaBrwn) January 14, 2019

As expected @Channel9 #AusOpen coverage is crap & lazy. Couldn’t even be bothered using own graphics just take @TennisAustralia rubbish & world feed commentary. I warned you @CraigTiley it would be cheap & nasty. Score -100. — Emily Blair (@_EmBlair) January 14, 2019

Well Channel 9’s coverage of the #AusOpen⁠ ⁠is as good as expected, amateur presentation, taking bad International commentary feeds & topped off by Erin Molan informing viewers that there’s a number of Greek supporters in the crowd at the Tsitsipas match as he is Greek 🤦🏻‍♂️#9WWOS — James T-Wakefield (@JamesToffoliW) January 14, 2019

Many other fans took to social media to vent their annual frustrations about scheduling, tennis identities and general presentation.

@Channel9 excruciating ads for married at first sight during the #AusOpen telecast. Garbage programming — Daniela DiMarco (@RedGirL7) January 14, 2019

@Channel9 have the tennis and are showing the same game on 2 channels (gem and 9) whats the story here? surely we can get 2 different matches on #Ausopen — Adam Cox (@Adam_cox41) January 14, 2019

Channel 9 is so bad with the tennis I miss Hamish McLachlan #AusOpen — Tim Cahill FC (@RohanCT) January 14, 2019

Big mistake by @TennisAustralia & @CraigTiley giving #AusOpen broadcast rights to @wwos. Terrible coverage & nowhere near the excellent standard viewers are used to from @Channel7. Do the world a favour @Channel9 & go back to what your good at - re-runs of the Big Bang Theory! — Perrin Brown (@PerrinPezzaBrwn) January 14, 2019

The quality of picture on 9 Gem @9Gem is absolute trash. It’s 2019, people have big HD tv’s, and we have to watch the Aus Open in painful below par standard definition; it’s freaking blurry and near impossible to see the ball @AustralianOpen @Channel9 @rohan_connolly #AusOpen — ippxss (@ryanprrr) January 14, 2019

#AusOpen You are drowning out the energy and entertainment of the game itself Todd Woodbridge & Jim Courier. No need for you to be the entertainers here! Give the players & audience some space...please! — Oztralian (@Oztralian) January 14, 2019

When Nine and Seven swapped tennis and cricket I thought it was going to create fresh new commentary teams on both sides........really stayed a lot the same and didnt freshen up a thing for the viewers — Talking Beard (@StrayBeard) January 14, 2019

Nine announced last year its stable of tennis commentary stars would include hosts James Bracey, Rebecca Maddern and Jones as well as commentators Woodbridge, Courier, Dokic, Alicia Molik, Dylan Alcott, Sam Smith, Fitzgerald, Donegan, Geoff Masters Roger Rasheed.