Conversation so far:
Did Willie Mays play for the New York Giants?
Willie Mays played for the New York Giants from 1951 to 1957.
What happened when Willie Mays began his career for it to be a sour note?
Mays began his major league career on a sour note, with no hits in his first 12 at bats.
What did Willie Mays do after starting his career with no hits in his first 12 at bat?
On his 13th at-bat he hit a towering home run up and over the left field roof of the Polo Grounds off future Hall of Famer Warren Spahn.

Question: What happened after he hit the home run?
Self-contained rewrite: What happened after Willie Mays hit the home run on his 13th at-bat for the New York Giants?