A new coach, a marquee running back and a second-year quarterback brought renewed hope to the Jets this season. But one week in, that optimism has quickly diminished. Sam Darnold has mononucleosis and will not play on Monday night against the Cleveland Browns (0-1), Coach Adam Gase announced Thursday. There is no timetable for his return. Darnold had received a diagnosis of strep throat Tuesday night, but further tests revealed he had mono. Trevor Siemian, who signed a one-year deal with the Jets in March, will start in his place Monday night. “Anytime you lose your quarterback, it’s a big deal,” said Dowell Loggains, […]