Final answer:
A tennis player complaining of dry mouth, excessive thirst, vomiting, and sweet and fruity breath is likely experiencing diabetes.
Step-by-step explanation:
A tennis player complaining of dry mouth, excessive thirst, vomiting, and sweet and fruity breath is likely experiencing diabetes. Diabetes is a condition where the cells are unable to utilize glucose, causing increased blood glucose levels and subsequently increased glucose excretion in the urine. The sweet and fruity breath indicates elevated ketone levels, which can occur in uncontrolled diabetes.