London — American Bethanie Mattek-Sands was stretchered off court, screaming in pain, after her second-round match at Wimbledon was halted at one set all on Thursday. The player, who appeared to suffer a knee injury when she stumbled on midcourt at the beginning of the third set, was treated by doctors for more than 20 minutes on court, and given oxygen. "Help me, help me please," she screamed, as medics placed her on a stretcher. "It hurts, hurts so much."

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