Clear and simple calendars like NFL, not tennis, should be applauded in sport Sport Business The NFL, unlike tennis, should be applauded for its clear and simple sport calendar that sees athletes thrive, writes Ed Warner. Naomi Osaka, Gael Monfils, Jack Draper. Each retired from the Australian Open mid-match. No substitutes bench in tennis, so the ultimate anticlimax for spectators. Injuries are an occupational hazard, but across sport the sheer [...]