Gretchen Walsh began her quest for an Olympics berth in the splashiest way possible. The Virginia star broke a world record in the 100-meter butterfly to kick off Saturday’s first day of U.S. swim trials. She hasn’t earned the Olympic spot, as yet. Rather, she broke the record in winning her semifinal heat. Relive her moment, one of the biggest on the women’s sports scene this year Her time of 55.18 seconds broke Sweden’s Sarah Sjöström’s time of 55.48, which she set at the 2016 Olympics. It’s the first time an American swimmer has broken a world record at the Olympic trials since legendary Mi…