TOKYO—Belinda Bencic could become the first woman to clinch a singles tennis gold for Switzerland after she booked a place in the Olympic final with a hard-won 7–6(2) 4–6 6–3 victory over Kazakhstan’s Elena Rybakina on Thursday. Standing in front of her in Saturday’s title match will be Czech Marketa Vondrousova, who knocked out Ukrainian Elina Svitolina 6–3 6–1 in a one-sided contest. On the men’s side, 20-times major champion Novak Djokovic eased into the last four with a commanding performance against Japan’s Kei Nishikori but world number two Daniil Medvedev bowed out with a 6–2 7–6(5) loss to Spain’s Pablo Carreno Busta. Bencic was in tears after she closed out a nervy battle against the 20th-ranked Rybakina, who squandered multiple leads during a topsy-turvy semifinal on Centre Court. The win will ensure a tennis medal for Switzerland for the fourth Olympic Games in a row, while Bencic will have …