caption: FILE - In this Jan. 15, 2019, file photo, United States' <PERSON> reaches for a backhand return to Serbia's <PERSON> during their first round match at the Australian Open tennis championships in Melbourne, Australia. Some professional tennis players and coaches are having a hard time financially right now because of the coronavirus pandemic. Unlike their counterparts in team sports, they do not have regular salaries.(AP Photo/ <PERSON>, File)
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