Nikoloz Basilashvili (Georgian: ნიკოლოზ ბასილაშვილი, translit.: nik'oloz basilashvili, pronounced ; born 23 February 1992) is a Georgian professional tennis player. In July 2018, he made it into the main draw of the German Open in Hamburg as a qualifier and went on to win the tournament, defeating Leonardo Mayer in the final and becoming the first Georgian player ever to win an ATP tournament. In October 2018, Basilashvili won his second ATP title at the China Open by defeating world No. 4 Juan Martín del Potro in the final. He achieved a career-high ATP singles ranking of world No. 16 on 27 May 2019.
Nikoloz did not play at any Grand Slams during his junior career. He reached a career high combined (singles and doubles) of world No. 59 on 5 January 2009. He ended his junior career with a 35–22 record on singles and 14–17 on doubles.
Basilashvili played in his first ITF Junior Circuit tournament in late 2006 at the G2 Jerry Simmons Tournament. He lost in the first qualifying round. In 2007, he managed to break through the qualifying of two G4 tournaments in Israel and a G3 in Romania. Nikoloz lost in the Round of 16 in all of them. Later that year, he reached his first semifinal at any junior tournament doing that in doubles for the first time at the US Junior Hard Court Championships, partnering Patrick Daciek. In singles, he reached that round at the G4 USTA Illinois losing to Filip Krajinovic, in September.