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Former World Champion Anthony Crolla offers his words of advice for Petra Kvitova, who recently made her return to tennis. Kvitova came back from a career-threatening hand injury, sustained when she was stabbed by an intruder at her home in Prostejov, Czech Republic. Crolla has experienced something similar - his world title win in 2015 came less than a year after he suffered a fractured skull when confronting burglars. Crolla speaks to the Â鶹Éç's Caroline Barker about he felt returning to the sport at the time. Picture credit: Petra Kvitova and Anthony Crolla (Getty Images)