The National League owners awarded franchises to New York and Philadelphia at the same meeting, on December 6, 1882. The two teams have been rivals ever since. Though the Phillies have generally been a losing team, and almost always a worse team than the Giants, certain Phillies have hit very well against the Giants. Dick Allen, who played for the Phillies for 14 seasons in the 1960s and 1970s, hit .337/.426/.633 against the Giants. That’s an OPS of 1.058. Native San Franciscan Lefty O’Doul would hit .367/.423/.578, for an OPS of 1.001 in 187 plate appearances against the Giants. Cy Williams and Don Demeter also had OPSs over .975 against the Giants. In addition to O’Doul, former and future Giants in the top 15 include Pat Burrell and Gary Matthews. Dots Miller, an infielder with the Phillies 1920-21, wins the prize for the biggest gap between his OPS as a Phillie (.638) and his OPS as a Phillie batting against the Giants (.855).
The full list is here.