For the bettors this is unxepected result, dissapointed to see Novak lost but not with the results between Federer and Zverev, Zverev deserved to win the match with His playing.
Semis
Stefanos Tsitsipass vs D. Medvedev
Medvedev won their meeting 4 times, statistically Medvedev was above Tsitsipas, Tsitsipas is a good player and his victory against Novak will increase his confidence.
M. Berrettini vs Alexander Zverev
Their meeting score was 1-1, so both have chance to win.
This semis match will be very interesting.