The Pirates are one of the top home teams in baseball. They were 51-30 this year in their ballpark. Pitt was also good against the NL West going 20-12 and they were also one of the teams who are good against Left-Handed starters. Edinson is arguably the hottest of the Bucs' quartet of hot pitchers down the stretch, Volquez has pitched to a 1.78 ERA in his last 12 starts and finished the season with a scoreless streak of 18 innings.
This Pirates offense is top 10 in 4 categories including top-5 with batting average and OBP while SF's offense isn't ranked in the top 10 in anything. SF has to travel from West to East coast.
Pittsburgh is the better team and have a major advantage playing at home going 12-4 their last 16 at home.