US Open: Roger Federer reveals his key to avoiding injury
Roger Federer has managed to avoid serious injury in his career and the 20-time Grand Slam says sleep is crucial to that.
from Daily Express :: Tennis Feed https://www.express.co.uk/sport/tennis/1169372/US-Open-Roger-Federer-sleep-injury
via Express
US Open: Roger Federer reveals his key to avoiding injury
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