TOKYO—A Swiss tennis player won gold in singles at the Olympics and it’s not Roger Federer or Stan Wawrinka. Belinda Bencic accomplished something Saturday that her better-known fellow Swiss players never managed. And she’s not done yet. The 12th-ranked Bencic beat Marketa Vondrousova of the Czech Republic 7–5, 2–6, 6–3 at the Tokyo Games for the first major title of her career and she’ll also contest the women’s doubles gold medal match on Sunday. Bencic and Swiss partner Viktorija Golubic face the top-seeded Czech team of Barbora Krejcikova and Katerina Siniakova. “It’s unbelievable to have two medals, to have one gold and the other still to be decided,” Bencic said. “I will give all the energy that I have left in me.” Federer and Wawrinka won gold together in men’s doubles in 2008 then Federer lost the 2012 singles final to Andy Murray at Wimbledon. Not even Martina Hingis, the …