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![<p>
Spain's Rafael Nadal serves to Australia's James Duckworth in their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Aaron Favila)
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![<p>
Jamie and Judy Murray watch a presentation for Britain's Andy Murray following his first round loss to Spain's Roberto Bautista Agut at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Andy Brownbill)
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![Svetlana Kuznetsova of Russia returns against Kristie Ahn during the first round of the Citi Open tennis tournament, Monday, July 30, 2018, in Washington. (AP Photo/Carolyn Kaster)]()
![Switzerland's Roger Federer returns the ball to Germany's Jan-Lennard Struff during their men's singles match, on the fifth day of the Wimbledon Tennis Championships in London, Friday July 6, 2018. (AP Photo/Ben Curtis)]()
![Mackenzie McDonald of the US, right, poses with fans after defeating Guido Pella of Argentina in the men's singles match on the fifth day at the Wimbledon Tennis Championships in London, Friday July 6, 2018. (AP Photo/Tim Ireland)]()
![Kevin Anderson of South Africa serves to Andreas Seppi of Italy during their men's singles match on the fourth day at the Wimbledon Tennis Championships in London, Thursday July 5, 2018. (AP Photo/Ben Curtis)]()
![Spain's Garbine Muguruza leaves the court after losing her women's singles match against Alison Van Uytvanck of Belgium, on the fourth day at the Wimbledon Tennis Championships in London, Thursday July 5, 2018. (AP Photo/Ben Curtis)]()
![United States' Mackenzie McDonald makes a backhand return to Bulgaria's Grigor Dimitrov during their second round match at the Australian Open tennis championships in Melbourne, Australia, Wednesday, Jan. 17, 2018. (AP Photo/Andy Brownbill)]()
![Romania's Simona Halep reacts after defeating Australia's Destanee Aiava during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 16, 2018. (AP Photo/Vincent Thian)]()
![Denmark's Caroline Wozniacki celebrates after defeating Romania's Mihaela Buzarnescu during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 15, 2018. (AP Photo/Dita Alangkara)]()
Mackenzie McDonald
