Serbian media have raised concerns about Novak Djokovic's physical condition at Wimbledon, despite the sixth seed advancing comfortably through the early rounds.
The 24-time Grand Slam champion has caught the attention of observers in his homeland who fear he may not be at peak fitness.
Serbian outlet Blic has been closely monitoring Djokovic's behaviour during changeovers at this year's Championships.
They believe the 38-year-old is experiencing breathing difficulties based on his use of specific stretching positions between games.
Serbian outlet Blic have raised concerns over Novak Djokovic's physical condition
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These concerns emerged after Djokovic required medical attention during his opening match against Alexandre Muller on Tuesday.
The publication has specifically highlighted Djokovic's use of full-body stretching positions during breaks in play.
They report observing him placing his hands behind his head whilst in a deep squat position as part of his breathing routine.
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The 38-year-old has been spotted using different breathing techniques
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Blic has interpreted these movements as signs that the Serbian star is struggling to breathe as freely as he would normally expect.
The report also highlighted what they described as "big problems" at the beginning of the third set in his match against Muller, which prompted the medical timeout.
Despite these physical concerns, Djokovic's on-court results have remained impressive.
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He experienced only a minor setback when he dropped the second set to Muller in a tiebreak, but recovered to win the following two sets convincingly.
His second-round performance against Dan Evans was particularly dominant, securing a 6-3, 6-2, 6-0 victory on Centre Court.
If breathing and muscle issues are affecting the former world No 1 as suggested, they have not translated into any noticeable impact on his match performances.
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The Serb has required medical attention on multiple occasions throughout the tournament so far
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Djokovic himself has moved to reassure fans about his fitness levels.
Following his victory over Evans, he stated: "Last year, particularly in the early rounds, I was still doubting whether my knee will hold up or whether I was able to slide or do my movement as freely as I want."
He emphasised the difference this year, saying: "This year I'm not, obviously, thinking about the knee, nor do I have any other major physical issue to think about in that sense.
"Of course, there's always something every day that you address minorly. But overall body's in very good shape."