YOKOHAMA, Japan—Getting ready to reach softball’s peak and make her Olympic debut, Janie Reed was on a training field at Marine Corps Air Station Iwakuni in western Japan. Across the Pacific Ocean, 7,452 miles away, another important family first was unfolding in Miami: Husband Jake Reed was about to walk onto a major league mound for the first time. “Luckily, the staff was watching the box score,” she said. “And when he came in, they let me kind of slip away for a second so I could watch it.” They have a one-of-a-kind bicoastal marriage. Janie is the starting left fielder and No. 2 hitter for the United States as Americans try to regain the gold medal they lost to Japan in 2008. Her sacrifice fly drove in the second run in Wednesday’s opening 2-0 win over Italy and her fifth-inning bunt set up Amanda Chidester’s RBI single in Thursday’s …