Nestor was the first man to complete the Big Titles sweep in doubles (winning every major and Masters event, the Tour Finals, and an Olympic gold medal over the course of a career), an achievement only matched by the Bryan brothers.

Nestor is widely considered one of the foremost doubles players in history, due to his longevity and continued success at the top of the game.

He first came to prominence in the public eye that year by defeating then world number one Stefan Edberg in a hard-fought singles match in Vancouver.

He was part of the squad who made history for Canada in 2013 as they were the first Canadian team in the Open Era to reach the World Group semifinals.

They won the first title of their official partnership at the 2007 St. Petersburg Open, then advanced to the 2007 Paris Masters final as the second seeds, where they lost to No.

Nestor and Knowles partnered once more at the 2007 Tennis Masters Cup after having qualified for the year-end event as the top seed.

[9] Nestor had chosen to partner with Zimonjić because he felt as though the game had transformed into a more powerful and physical version of doubles.

The New York Times reported that "on the tour, it's known that they (Nestor and Zimonjić) joined up, after years in the top 5 with other partners, specifically to usurp the Bryans.

[15] At the first tournament of his season, the 2014 Brisbane International, Nestor partnered with Mariusz Fyrstenberg and won his 82nd doubles title.

He won his third doubles title of the season and 84th of his career at the 2014 Mutua Madrid Open, surpassing Todd Woodbridge for 3rd overall in ATP history.

[20] Despite a disappointing finish at the US Open, Nestor rose to number 3 overall and he and Zimonjic clinched a spot in the ATP Tour finals following the tournament.

[23] In January 2016, Nestor and Radek Štěpánek became the oldest team to reach a Grand Slam men's doubles final at the Australian Open, losing in three sets to Jamie Murray and Bruno Soares.

At the age of 46, he played his last professional match on September 15 at the Davis Cup World Group play-offs home tie against the Netherlands in Toronto partnering Vasek Pospisil, losing 6–4, 3–6, 4–6, 4–6 to Matwé Middelkoop and Jean-Julien Rojer.

Born Danijel Nestorović (Serbian Cyrillic: Данијел Несторовић), his Serbian parents moved to Canada short of his fourth birthday in 1976 and settled in Toronto, where he attended Elkhorn public school and then Earl Haig Secondary School for a special sports program known as APGA (Academic Program for Gifted Athletes).

In July 2005, Nestor married Nataša Gavrilović (Serbian Cyrillic: Наташа Гавриловић) his girlfriend of two years.

They welcomed their first daughter, Tiana Alexis, on December 15, 2008, only two weeks after his doubles partner Zimonjić and his wife had twins.

[30][31] On June 28, 2011, it was announced that Nestor would receive a star on Canada's Walk of Fame and was inducted on October 1 at Elgin Theatre in Toronto.