In one of their worst performances of the season, the Padres beat themselves in a shutout to the Dodgers, which reclaimed first place.

LOS ANGELES — It was touted as the biggest series of the month. It was billed as a potential passing of the torch, with the San Diego Padres threatening to win the National League West for the first time in 19 years. Instead, Sunday’s finale ended in a three-game sweep — and a relatively convincing one, at that.