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The 20-time Grand Slam champion said he was having some "unpleasant moments" but was hoping to feel better soon and would keep people informed about his plans over future tournaments.
Canada's Kylie Masse took a good lead from the start and held it at the halfway mark but McKeown switched gears out of the turn and clawed back to win in 57.47.
Nagal, who had beaten Uzbekistan's Denis Istomin in the opening round, went down 6-2, 6-1 to the second seed in just over an hour.
The Indian pair lost 0-6, 7-6(0), 10-8 to Ukrainian twins Nadiia Kichenok and Lyudmyla Kichenok.
Nagal became only the third Indian to win a men's singles match at the Olympic Games.
Both the men's women's hockey teams will be in action.
Rafael Nadal, Dominic Thiem, Stan Wawrinka, Nick Kyrgios, Serena Williams and Simona Halep have already announced their decisions to skip the pandemic-delayed Olympics.
Djokovic absorbed a barrage of powerful hitting from Canadian Denis Shapovalov to move on step closer to a record-equalling 20th Grand Slam title.
Playing in his 50th Grand Slam quarterfinal, Novak Djokovic recorded a century of tour-level wins on grass.
Defending champion Djokovic, bidding for a sixth Wimbledon and record-equalling 20th Grand Slam title, was imperious during a grasscourt masterclass on Centre Court.