Photos of sporting events indoors with a Nikon D60?

I have a nikon D60, and I'm having a tough time taking action shots without any blur? I have tried to increase shutter speed on the shutter priority mode, but then not enough light gets in and the photo is very dark if not black? The shutter speed in the sport mode also just does not seem to be fast enough. I'm photographing wrestling matches? In the Shutter priority mode I also increased the ISO to hi and 1800 but it does not seem to help. Can I increase the F stop/ apature without loosing the fast shutter speed?

The only answer here is: fast lens.

You will need a fast lens, with good telephoto zoom. This is EXPENSIVE!

Fast lens are like f/2.8, f/2, f/1.8 etc.

Try the Nikon 70-200mm f/2.8