Net gain: Serena Williams reaches her ninth U.S. Open final

New York • Serena Williams was a bit shaky at the start of her U.S. Open semifinal.For all of six minutes.That’s how long it took her to drop the opening two games. Williams spent the next hour playing flawlessly, particularly up at the net, grabbing 12 of 13 games to beat No. 19 seed Anastasija Sevastova of Latvia 6-3, 6-0 and reach her ninth final at Flushing Meadows and 36th at all Grand Slam tournaments.“I’ve been working hard on my volleys. I have won a few doubles ch