This is not the Federer whim we so admire as a tennis player. He struggled badly against badly against Evans - the 29 ranked player in tennis beating him 7(10) - 6(8), 3-6, 7-5.
He is lucky that his next player he has to play is the weakest player in the field - not in the top 50 - but after that he has to play either Shapovalov (the number 12 ranked player) or Frotz who took Djokovic to a 5-setter in the Australian Open.
Thiem also got a bad fright from Karatsev - whose claim to fame was him reaching the semi's in the Aussie open as a qualifier where he was not disgraced in his loss against Djokovic - who won the first set , but Thiem win the other two sets with relative ease.
So the quarterfinals will be between the following players:-
Thiem vs Bautista-Agut
Neither Thiem nor Bautista-Agut is in good form and it is difficult to assess ho will be the winner ultimately. However, bearing in mind that the players Thiem played against and wn in the EOYT in November - Nadal and Djokovic - I believe that he should be the favourite to win;
Rublev vs Fucsovics
Rublev is the inform player in the series, This year Rublev played in 14 matches this year and won in 13 of those. Hos only loss was against Medvedev om the Australian Open in which match he suffered badly from dehydration.
Interesting enough - as Rublev playing Fucsovics in the quarters would be the second time the two meet within a week - the two were finalists in Amsterdam on Sunday, In that game Fucsovics put up a brave display in the first set - but Rublev still won the trophy in 2 sets.
Federer vs Basilashvili
If Federer does not win this match 6-1, 6-1 I will be surprised.
Shapovalov vs Fritz
Looking at recent results a prediction of a winner is impossible. or near to it. Only looking at the PTA rankings Shapo should be the winner, but he is not wining
My forecast is consequently as follows:-
Thiem to beat Bautista-Agut
Rublev - walkover
Fr itz to beat Shapovalov
Federer to beat Basilashvili