Worst level of play to win a grand slam final

Third Serve

Legend
This most recent one comes to mind.

Other "eh" performances: RG 2004 final, AO 2006 final, AO 2018 final, W 2019 final, AO 2020 final.
 

Djokodalerer31

Hall of Fame
Either Thiem 2019 USO or Gaudio 2004 RG...in both cases one choker outchoked another in a borefest of a match! At least in latter case players shown interest, unlike 2019, where one didn't want to win a match, picked up by another...the one, who wanted to win the least - lost...LOL
 

Nadal_King

Semi-Pro
Thiem imo played tough matches and played good till sf, final was a different thing but till sf thiem seemed like a well deserving grand slam winner
 

BumElbow

New User
Absolutely 2004 Roland Garros men's final Gaston Gaudio vs. Guillermo Coria. Though the 5th set tiebreak from this year's U.S. Open's men's final is also a candidate!
 

weakera

Legend
Maybe Federer 2018 AO. One of the weakest draws in the history of tennis and would have lost in the final with the roof open to Marin Cilic.
 
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