Conversation so far:
When was Wilhelm born?
In 1954, Wilhelm was a key piece of the pitching staff that led the 1954 Giants to a world championship.
Who were Wilhelm's parents ?
CANNOTANSWER.
When did Wilhelm first start playing baseball?
Though Wilhelm was primarily a starting pitcher in the minor leagues.
Are there any notable teams he played for or against?
Wilhelm made his MLB debut with the Giants on April 18, 1952 at age 29, giving up a hit and two walks while only recording one out.
What were some of his wins?
Pitching exclusively in relief, Wilhelm led the NL with a 2.43 ERA in his rookie year.
He won 15 games and lost three.
Did he win any other games ?
Wilhelm finished in the top ten in Most Valuable Player Award voting that season, becoming the first relief pitcher to finish that high.
Did he win any awards?
The team won the World Series in a four-game sweep.

Question: Which team was this that won the World Series ?
Self-contained rewrite: Which team won the World Series in a four-game sweep?