TOKYO—Sifan Hassan scored two remarkable victories on the Olympic track Monday. Her gold-medal run in the women’s 5,000 meters came a mere 11 hours after she picked herself up from a scary fall on the final lap of her 1,500-meter heat to not only finish that race—but win it, as well. Those two wins kept Hassan, the Ethiopian-born 28-year-old who now competes for the Netherlands, very much in the mix for not one, not two, but three medals—in the 1,500, the 5,000 and the 10,000. It’s a never-before-attempted Olympic journey that will require six races over eight days. It’s a journey most thought would be impossible even before the sort of fall that can take even the heartiest of runners off the track. “To come back (11) hours after that, and to run the race,” said silver medalist Hellen Obiri of Kenya, “and you can see that she’s great.” The …