Conversation so far:
when did Steve Carlton's career begin with the phillies?
he was traded to the Philadelphia Phillies before the 1972 season for pitcher Rick Wise.
Which team had he played with before this/?
Cardinals.
What was his record like before he joined the phillies?
Was he traded because he was good or bad?
Carlton had won 77 games to Wise's 75, and both were considered among the game's best pitchers.

Question: What was his ERA?
Self-contained rewrite: What was Steve Carlton's ERA?