Which Slam will Federer 'blame' the most if (when) Nadal gets to 20 @ 2020 Roland Garros? (poll 10622605)

Which Slam will Federer 'blame' the most if (when) Nadal gets to 20 @ 2020 Roland Garros?

AO - Nadal.

AO - Safin (semifinal).

Wimbledon - Nadal.

Wimbledon - Djokovic (40-15).

USO - Del Potro.

USO - Cilic (semifinal).

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