Andrey Andreyevich Rublev is a Russian professional tennis player. He has been ranked as high as world No. 5 in singles by the ATP, which he first achieved in September 2021. He has won 16 ATP Tour singles titles, including two Masters 1000 at the 2023 Monte-Carlo Masters and at the 2024 Madrid Open. He has reached the quarterfinals of all four majors, but is the only male player in the Open Era to have done so the most times without progressing to the semifinals. Rublev broke into the top 10 in the ATP rankings in October 2020. He has won four ATP doubles titles, including a Masters 1000 title at the 2023 Madrid Open with Karen Khachanov, and in addition a gold medal in mixed doubles at the 2020 Summer Olympics with Anastasia Pavlyuchenkova.

The Association of Tennis Professionals (ATP) is the governing body of the men's professional tennis circuits – the ATP Tour, the ATP Challenger Tour and the ATP Champions Tour. It was formed in September 1972 by Donald Dell, Jack Kramer, and Cliff Drysdale to protect the interests of professional tennis players, and Drysdale became the first president. Since 1990 the association has organized the ATP Tour, the worldwide tennis tour for men and linked the title of the tour with the organization's name. It is the governing body of men's professional tennis. In 1990 the organization was called the ATP Tour, which was renamed in 2001 as just ATP and the tour being called ATP Tour. In 2009 the name of the tour was changed again and was known as the ATP World Tour, but changed again to the ATP Tour by 2019. It is an evolution of the tour competitions previously known as Grand Prix tennis tournaments and World Championship Tennis (WCT). The ATP's global headquarters are in London. ATP Americas is based in Ponte Vedra Beach, Florida; ATP Europe is headquartered in Monaco; and ATP International, which covers Africa, Asia and Australasia, is based in Sydney, Australia.