Novak Djokovic had a different practice partner on the Aorangi practice courts at Wimbledon on Thursday morning - his nine-year-old Stefan. The world No 2 was in a relaxed mood ahead of his second-round clash with British wildcard Jacob Fearnley on Centre Court.
Djokovic was having a light hit and getting his injured knee warmed up before stepping onto his favourite court.
And he was joined by his eldest son for a 10-minute hit towards the end of his session.
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In Serbian, Djokovic instructed his son to perform a "couple of slices" and to keep his "knees down".
It is a sign for years to come that Stefan is growing increasingly interested in tennis.
The child could not have a better coach than his father, who is hunting a record-breaking 25th Grand Slam title at the All England Club.
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Djokovic had to do plenty of preparation ahead of his match with Fearnley as he had never seen the world No.277 in action.
"No, no, I haven't seen him hit. I don't know really anything about him. So I'll have to do my homework," Djokovic said ahead of the second-round tie.
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"I know he was granted a wild card to play in the tournament. So yeah, I'll definitely analyze his match of today and see what I'm up against. Obviously him being British, he's going to have the crowd. You never like to play British in Wimbledon.
"But, you know, I'm looking forward. For me, it's just about really maintaining this good sensation, good feelings on the court, getting my body and knee in shape to sustain the high level of potential five sets. That's what matters the most."