Hard Courts:
The Australian Open uses a synthetic surface called Plexicushion and the U.S. Open uses a product called DecoTurf.
DecoTurf is faster than Plexicushion.
Rebound Ace is another hard court which is faster now faster than DecoTurf after they slowed DecoTurf down.

Links:
Comparison of Tennis Court Surfaces | Chron.com
Tennis court - Wikipedia