Britain's Andy Murray says he is "not offending anyone" by continuing to play despite his injury problems and has extra motivation from seeing Swiss great Roger Federer still competing.
Murray, 34, returns to singles action for the first time in three months at Queen's this week after a groin injury.
The Scot says he is "not perfect" but is happy with the way he is practising.
"The reason why I'm still doing it is because I enjoy it and I don't see any problem with that," he told BBC Sport.
"I'm not offending anyone and it's not hurting anyone.