The future of Nick Kyrgios in professional tennis hangs in the balance as he faces a potential ban for testing positive for cocaine. The key factor in determining the length of his suspension will be whether Kyrgios can establish that he took the substance out of competition. If he is unable to prove this, he could face a lengthy ban of up to four years. The situation has raised questions about Kyrgios' conduct and the implications of substance use in sports, as authorities continue to investigate the circumstances surrounding his positive test.