Fitness, strength, perseverance, focus - that's what it takes to be a Barclays Ball Kid at the ATP World Tour Finals.
Lucy, aged 14: “We're lucky to even be here. We saw a girl post on Instagram and we then thought we would apply.
Standing in the tunnel before the first match was the most nerve racking moment, but once we were on court and picked up the first ball we have really enjoyed every...
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