Perhaps the most frequently contested matchup between a pitcher and batter who are both in the Hall of Fame (incomplete early MLB records make this difficult to ascertain with 100% certainty) was the over 300 plate appearances where these two superstars faced each other. Their careers overlapped almost entirely between the early 1940s to early-mid 1960s, with both playing in the National League for their whole careers. The hitter had the significant upper-hand with an OPS of over 1.000 in their matchups, even though the lefty-lefty split should've favored the pitcher in theory. Name both of these players.
Warren SPAHN, Stan MUSIAL