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Sock is the third wild card
Anderson will compete at the grass-court tournament for just the second time, having also played there in 2008 when he was 22. The South African star has proven a dangerous foe on this surface. In 2018, he reached the Wimbledon final.
Karlovic will make his 10th appearance in the Hall of Fame Open. The 2016 champion owns a 16-8 record in Newport, and he also reached the final in 2014 and 2015.