Justin Upton homered and Matt Kemp went hitless in three at-bats in their debuts with the San Diego Padres, a 4-3 loss to the Seattle Mariners on Wednesday. Kemp and Upton, each two-time All-Stars, were two of the main acquisitions in a busy offseason for the Padres. Upton, the centerpiece of a trade with the Atlanta Braves, was 0 for 2 until he hit a towering home run to straightaway center field in the seventh. ''First game of spring training, you're just trying to work on your timing and see pitches and try to make something happen if you can.'' D.J. Peterson, a top prospect in the Mariners organization, hit a solo home run in the first. More...