Nick Kyrgios- what am I missing?

“Does he not train enough because the body breaks down? Or does the body break down because you don’t train enough?” McEnroe said on Tuesday night.

“He wouldn’t know because he hasn’t trained hard enough to know.

“You’ve got to try the other way before you dismiss it.”

January 16, 2019

• Impact on performance: Her nervousness was occasionally severe enough that commentators and fans accused her of "choking" in high-pressure matches. This was particularly noted in the 1971 Wimbledon final against Evonne Goolagong and during certain early-round losses at Wimbledon, where the pressure to win was immense.
• Wimbledon struggles: Her anxiety was most evident at Wimbledon, where the pressure of trying to complete the Grand Slam often affected her performance. This is cited as one of the main reasons she "only" won the Wimbledon singles title three times, a relatively low number compared to her dominance at other majors.
• Physical manifestations: The nerves could manifest physically; one observer recalled her breaking out in "big red blotches on her chest and back" when she had to give a public speech at the Wimbledon winners' ball in 1966.
• Overcoming nerves: Despite these struggles, she was known for her mental toughness and eventually found ways to manage her anxiety, as evidenced by her 1970 Grand Slam victory, which included a grueling, marathon Wimbledon final win over Billie Jean King.