Here is a bunch of text from wikipedia:
The 2010 National League Division Series (NLDS) were two best-of-five game series to determine the participating teams in the 2010 National League Championship Series. The three divisional winners and a fourth team—a "Wild Card"—played in two series from October 6 to 11. TBS televised all games in the United States.
Under MLB's playoff format, no two teams from the same division were matched up in the Division Series, regardless of whether their records would normally indicate such a matchup. Home field advantage went to the team with the better regular-season record with the exception of the wild card team, which defers home field advantage regardless of record. The matchups were:
- (1) Philadelphia Phillies (Eastern Division champions, 97–65) vs. (3) Cincinnati Reds (Central Division champions, 91–71): Phillies won the series, 3–0.
- (2) San Francisco Giants (West Division champions, 92–70) vs. (4) Atlanta Braves (Wild Card qualifier, 91–71): Giants won the series, 3–1.
The Phillies and Reds had met in the postseason once before: in the 1976 NLCS, which the Reds won 3–0. The Giants and Braves also had one prior postseason series—the 2002 NLDS—which the Giants won 3–2.