Manic Monday finished on a somewhat disappointing note when Britain's Emma Raducanu was forced to retire from her fourth-round match against Ajla Tomljanovic due to difficulty breathing. After a close opening set that came down to a couple points, the 18-year-old quickly fell behind 3-0 in the second in front of her home crowd. Raducanu was in visible discomfort, grabbing her stomach and bending over before ultimately calling for the trainer.

Following Raducanu's retirement, former No. 1 John McEnroe gave his take on air.

"It appears it got to be a little too much, which is understandable. Particularly with what we have been talking about these last six weeks with Naomi Osaka not even here—how much can players [can] handle," McEnroe said during the Wimbledon broadcast.

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McEnroe's comments sparked a whirlwind of conversation on social media and many fans disagreed with the seven-time major champion. McEnroe's statements strongly suggested, in their view, that Raducanu wasn't actually suffering from a medical issue, but was instead struggling with the weight of the moment.

TV personality Piers Morgan, who seems to often find his into controversy, did so yet again when he not only agreed with McEnroe, but offered a rebuff of his own.

Misspelling her name, he tweeted: "Ms Raducuna's [sic] a talented player but couldn't handle the pressure & quit when she was losing badly. Not 'brave', just a shame. If I were her, I'd tell my fans to stop abusing McEnroe, & seek his advice on how to toughen up & become a champion like he was."

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Three-time major champion Andy Murray knows a thing or two about injuries and was quick to fire back at Morgan via Twitter.

"I think that's a very harsh take on the situation Piers."

Morgan replied: "Well, I just felt the reaction to what McEnroe said was absurdly OTT. Didn't you?"

"I think some of what he said was fair yes.." Murray tweeted back, "however the timing of it was a bit off considering nobody had any clue what her issue was injury/illness/breathings issues etc at the time of his comments."

Raducanu is yet to release a statement on her retirement, but was clearly in pain and distress before calling the match.