"Fixing Baseball Games" joke

Three women were sitting around and bragging about their children. The first one says
You know my son he graduated first in his class from Stanford. He is now a doctor making $250000 a year in Chicago.

The second woman says

You know my son he graduated first in his class from Harvard. he is now a lawyer making half a million dollars a year and he lives in Los Angeles.

The last woman says

You know my son he never did too well in school. He never went to any university but he now makes one million dollars a year in New York working as a sports repairman.
The other two women ask What is a sports repairman?

The woman then replies He fixes games... you know hockey games football games baseball games....