Alexandr Oleksandrovych Dolgopolov (Ukrainian: Олександр Олександрович Долгополов) (born 7 November 1988), formerly known as Oleksandr Dolgopolov, Jr., is the top-ranked Ukrainian male tennis player. He changed his first name spelling to the current form in May 2010. Dolgopolov reached the quarterfinals of the 2011 Australian Open and achieved a career-high singles ranking of World No. 13 in January 2012.
Alexandr's father, Oleksandr Dolgopolov, was a professional tennis player for the Soviet team, and his mother was a gymnast. He started playing tennis at age 3, coached by his father. The senior Dolgopolov was also the coach of Andrei Medvedev, Ukraine's most successful tennis player to date. At a young age, Dolgopolov lived on the tour with his parents, traveling frequently and playing players such as Medvedev, Andre Agassi, and Boris Becker. Players such as Jim Courier remembered hitting balls with Dolgopolov when he was a toddler.
As a junior, Dolgopolov reached as high as No. 21 in the combined world rankings in January 2005.