What to know

• NEW YORK — Novak Djokovic grinded through physical and internal ailments, made one mistake after another and could not find what it took to beat a feisty, younger opponent who was not intimidated under the lights against tennis’ most decorated player. The 39-y...S1S2
• Argentine Mariano Navone stunned Novak Djokovic in a historic US Open first-round win, ending the Serbian’s 78-match Grand Slam opening-round winning streak and advancing to the second round after a five-set thriller.S4
• Novak Djokovic grinded through physical and internal ailments, made one mistake after another and could not find what it took to beat a feisty, younger opponent...S7
• The 39-year-old looked physically spent throughout the match and was regularly doubled over in pain.S8