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Former champion Zach Johnson and South Africa's Louis de Jager have withdrawn from the 149th British Open after testing positive for Covid-19.
American Ryan Moore has also pulled out of the year's final major at Royal St George's due to a back injury, taking the total number of withdrawals so far to 16.
Adam Long, Sam Horsfield and Dylan Frittelli are now in the field, with Wade Ormsby, Matthieu Pavon and Ross Fisher next on the reserve list.
Johnson, who won the US Masters in 2007, lifted the Claret Jug at St Andrews in 2015 following a play-off with Louis Oosthuizen and Marc Leishman.
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Reigning US Masters champion Hideki Matsuyama and two-time winner Bubba Watson withdrew on Sunday due to Covid-19, along with 2001 Open champion David Duval.
No reason was given for Duval's withdrawal but the 49-year-old did shoot 91, 78 at Portrush two years ago.
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