With her husband, Justin, by her side, Mattek-Sands was attended to by paramedics for around 20 minutes, before being sent to a hospital via ambulance.
America's Bethanie Mattek-Sands was stretchered off court screaming in pain after suffering a serious knee injury during her second-round women's singles match at Wimbledon on Thursday (July 6).
Mattek-Sands needed morphine and oxygen as she went into shock on Court 17 after appearing to dislocate her right knee-cap in a horror fall.
Cirstea jumped over the net and gasped as her stricken opponent was sprawled on the deck.
Mattek-Sands's doubles partner, Lucie Safarova, with whom she shares the world number one ranking as well as four Grand Slam titles, also arrived at the scene in tears.
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"I tried to comfort her as much as I could but, I mean, you could feel the pain. Sorana, help me. Sorana, help me, '" Cirstea said. Her knee was in a very weird position.
"The first response to Court 17 was within one minute by a qualified ambulance technician", the club said. I think was tough because she was stuck on this, Sorana, help me, Sorana, help me.
To the casual tennis fan, Mattek-Sands is nearly certainly best known for her dress sense.
Tennis legends past and present rushed to Twitter to send Mattek-Sands their best wishes as news of the incident broke.
Mattek-Sands, 32, was forced to retire from the second-round match with the score 4-6, 7-6 (4), 0-0 (40-15).