https://www.usopen.org/en_US/draws/index.html?event=MS I don't think that Djokovic is anything like a lock in the US Open and I don't think Nadal is anything like a lock in the French. So my first prediction is that someone else other than the expected winner prevails in each tournament, though in the case of the French, that someone else may well be Nole. Nobody is match tough yet, so anything could happen. Though he had a tough loss to Bautista-Agut the other day, I'm kind of leaning to Medvedev who has a very good draw. Other possibilities: Thiem, Tsitsipas, Raonic, Dimitrov
On the women's side, I'll take Kenin. Other possibilities: Osaka, Pliskova, Serena. With my record, though, everyone I listed will probably get knocked out in the first two rounds.