1) Bad serves 2) Cracks in a crust 3) Defects 4) Earthshaking matters 5) Errors at Wimbledon 6) Fictional cult 7) Flaws 8) Groundbreaking discoveries 9) Puts the blame on 10) San Andreas and the like 11) Service errors 12) Some tennis serves 13) Tennis serves gone awry 14) Weaknesses 1) Errors 2) Vices 
Errors committed on course. For examples: see wrong course, dropped bar, missed contact, flyoff.
fault, faults 1. A defect or imperfection; a flaw; a failing; such as, a fault in the brakes; a fault in one's character. 2. Responsibility for failure or a wrongful act. 3. An error or mistake.
deep cracks caused by movement of rock during earthquakes. Different rock types are often seen on each side of a fault.