Australian Open 2018

[mateinone]

Yes & No WW
I would be very surprised if Sam didn't rue the fact she hasn't been able to perform down here and that she hasn't been able to perform well in the big tournaments regularly.

Also she has won more titles on hard courts than on clay (5-4). As well as made more finals (15-9), so it suggests she certainly can play hard courts.

I think she has had a great career of course and she has been the best Australian Woman in my lifetime and made the number 1 ranking. So that is superb... but that doesn't mean she has performed to her potential.
Of her 57 Grand Slam tournaments.
She has failed to make the 1/4 finals 50 times.
She has failed to make it past the 2nd round 34 times.

Calling out that she appears to have issues in big tournaments isn't saying that Sam isn't a great player. she is and has been. It is unusual though to have a Grand Slam winner and former number 1 with those numbers. The only other one off the top of my head that I can recall is Ana Ivanovic.
A look at her record shows
of her 48 Grand Slam Tournaments
She failed to make the 1/4 finals 40 times
She failed to make it past the 2nd round 16 times.

Now Ana (like Sam) had a great tennis career, but it was one that would be considered inconsistent and perhaps susceptible in big tournaments.