Conversation so far:
What team signed him?
Berra was called up to the Yankees and played his first game on September 22, 1946.
How long was he there?
he played 7 games that season and 83 games in 1947.
He played in more than a hundred games in each of the following fourteen years.
What did he do in 1948?
CANNOTANSWER.

Question: What was his best game?
Self-contained rewrite: What was Yogi Berra's best game?