Fernando Tatís Jr. homered in his third consecutive game, Xander Bogaerts and Elías Díaz added two-run homers, and the San Diego Padres rolled toward the postseason with a 5-1 victory over the Arizona Diamondbacks on Saturday night. Several hours before the first pitch, the Padres (89-72) lost their chance for homefield advantage in next week’s NL wild card series against the Cubs when Chicago beat St. Louis for its 91st win. The Padres still won for the sixth time in seven games, building momentum as they head into their second straight postseason appearance.