I feel like this was a good result for Ostapenko, first WTA player to make QFs at the tournament after her maiden slam since Clijsters a decade ago, took out a Top 5 player in Svitolina and lost to an all time great in Venus.
The transition to hardcourt from grass should be less difficult. I wouldn't expect many repeat from the Wimbledon SFists only because the group here is so unusual.
For the men, I think Federer is the most likely to be in the final four in NY. Cilic has a decent shot, he's playing well and he's won the event in 2014 and made SF in 2015. If the field is more open and he continues playing well, he absolutely could be in the SFs. Berdych and Querrey I would be very surprised to see them make a run.
For the women, I think both Konta and Venus have decent chances. Konta's best surface is heartcourts and Venus has been excellent at the majors lately. Muguruza could but I wouldn't expect it since she's been inconsistent and has never made SFs at a hardcourt slam but if she's on easily could. Rybarikova we can assume won't.
If I had to rank the likelihood of each I'd say
1. Federer (Strong possibility)
2. Konta (definite chance)
3. Venus (definite chance)
4. Cilic (Possible)
5. Muguruza (Wouldn't bet on it, but wouldn't be shocked)
6. Berdych (Unlikely)
7. Querrey (Unlikely)
8. Rybarikova (Lightning's not striking twice)
2018: Guru Race Winner (2019 Yoda Cup Guru), Australian Open Yoda Cup Champion, Wimbledon Yoda Cup Champion, Yoda Crew Best Newcomer
2020: Yoda Cup Guru Runner-up