rewrite this title Djokovic calls for anti-doping overhaul after 'strange' Sinner ban – 'System doesn't work'

Summarize this content to 2000 words in 6 paragraphs “Novak Djokovic has criticised “favouritism” in tennisu0027 anti-doping system following Jannik Sinneru0027s “strange” ban for a positive drugs test last year. Stream top tennis action live and on-demand on discovery+.”