NEW YORK -- For years, there has been a lot of hand-wringing over the specter of a post-Williams sisters landscape in American tennis.Venus and Serena Williams, at 36 and 34, are the oldest women in the draw and, presumably, they will graduate from the sport sooner rather than later.Friday at the US Open -- with the sisters both enjoying a day off -- offered a glimpse of what that future might look like. Frankly, it might not be completely awful.In a span of less than 15 minutes, 23-year-old Jack Sock sealed his victory over 2014 US Open champion Marin Cilic in straight sets, and 21-year-old Madison Keys finished off her conquest of Naomi Osaka, overcoming a 5-1 third-set deficit. Both are through to the fourth round and the second week of a major, an increasingly frequent occurrence.Which should calm down all those naysaying critics, at least until the fourth round.Sock, the No. 26 seed, surprised No. 7 Cilic 6-4, 6-3, 6-3.Keys rallied famously, winning 7-5, 4-6, 7-6 (3).Serena saw this coming. When asked about up-and-coming U.S. talent, she named Keys straightaway.I think thats very nice of her to say, said Keys, drawing laughter from the assembled reporters. It always feels good to hear Serena say something like that. More than anything, it just makes me want to go out and keep working and trying to get better.Keys has been to the fourth round of all four majors this year. If she can beat Caroline Wozniacki on Sunday, which seems reasonable, it would be her first trip to the quarterfinals this year.It was my goal to be more consistent and to make second weeks, Keys said. Those mornings when I didnt want to wake up at 6:15 to go to practice, those are the moments where I feel like getting through those and going out and having good practices have put me in this position.As much as I hate it, Im probably going to have to keep doing some of those.Sock, too, sounded like a drive-by casualty of blossoming maturity.I think Im putting things together better and better, he said after his win Friday. I definitely feel more confident out there in everything Im doing. Used to be some liabilities people would talk about in my game. I feel like I have cleaned those up pretty well.Overall, I feel my purpose out there. Im executing it well, and I feel like I know what Im going to do on almost every point.Sock is through to the second week of the US Open for the first time, while Keys has done it for the second consecutive year.Ryan Harrison, the 24-year-old from Louisiana, made his contribution to the American cause earlier, qualifying into the main draw and then stunning No. 5 seed Milos Raonic in the second round Wednesday. The third round was less spectacular; veteran Marcos Baghdatis defeated Harrison 6-3, 7-6 (4), 1-6, 6-1.After the biggest win of his career, Harrison will see his ranking move up at least 25 spots, into the ATP World Tours top 100.In retrospect, maybe Socks win shouldnt have come as such a shock.While Cilic entered the Open with eight straight match wins (and 14 of 15), the two met in July in a Davis Cup match in Portland, Oregon. Sock was down two sets in that match and somehow turned it around to win. Fridays win gave him six sets in a row over the Croatian.To come back and get three there and get us off to a good start, it only gave me confidence, Sock explained. It was the kick-start of the summer for me. And then playing him today, took a lot of stuff away from that.It was Socks first win over a top-10 player in a Grand Slam (third overall), and it came in a startlingly swift 1 hour, 41 minutes.Next up: No. 9 seed Jo-Wilfried Tsonga, an opponent somewhat less daunting than Cilic. That would put Sock in a place hes never been: the quarterfinals of a Grand Slam singles event.After the win, an animated Sock executed what looked like a dash of swashbuckling sword play.I became good buddies in Rio with one of the fencers, Miles Chamley-Watson, Sock said. He lives here in New York. He was able to come out here today. Kind of on the spot, I thought of turning the racket into -- I think its called a foil? 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