Bryce Harper bowed to his new fans, Mookie Betts and the World Series champion Boston Red Sox drew cheers far from Fenway Park and the great Mariano Rivera threw one more strike from the mound at Yankee Stadium. Then it was time to play Home Run Derby on a record-setting opening day. The ball was flying Thursday - Joc Pederson and the Los Angeles Dodgers connected eight times, and the total of 48 across the majors was the most ever to start.