text: In mixed doubles, he reached his first final at the 2003 US Open with Lina Krasnoroutskaya. He made it to the 2006 Australian Open and 2006 French Open finals, as well as winning the mixed doubles event at the 2007 Australian Open with partner Elena Likhovtseva.
  2007 was a year of change for Nestor. He and long-time doubles partner Knowles announced that they were parting ways after the 2007 US Open (the two won 40 titles together, including 3 Grand Slams, 1 ATP year-end finals, and 15 ATP Masters 1000 titles), as Nestor began a new partnership with Nenad Zimonjić. Nestor and Zimonjić had actually won an ATP World Tour 250 Series event together back in 2001. 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. 1 doubles team Bob and Mike Bryan. Nestor and Knowles partnered once more at the 2007 Tennis Masters Cup after having qualified for the year-end event as the top seed. Their finals win over Simon Aspelin and Julian Knowle earned them their first Tennis Masters Cup title at the year-end doubles tournament, and was a fitting end for one of the most successful doubles teams to ever play the game.