French Open 2019: Alexander Zverev's nervous five-set win over Dusan Lajovic underlines his constant tussle with self

Nerves have been Zverev's undoing before. For all his experience, his immense skill and his intense match-winning ability, Zverev is still young, and no matter how good, or how experienced you are at your job, losing focus is something that can happen to anyone.

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