out in the match tie-break, to finally score a 5–7, 6–4, [10–4] victory, and qualify for the semifinals. The second series of two Gold Group matches took place, with Juan Martín del Potro coming out on top for the second time in two meetings with Jo-Wilfried Tsonga 7–6, 7–6. Both players broke their opponent's serve several times, despite the tie-breaks finishes, with del Potro taking the advantage in the first game, and Tsonga immediately breaking back to 2–2, to see the set end in a deciding tie-break the Argentinian took, on an unforced error by his adversary. The second set took the same start as the first, with a break by del Potro, this time held to a 5–4 advantage, when Tsonga once again broke back, forcing another tie-break. Del Potro was once more victorious in the set decider, to clinch his first Masters Cup victory. The match between the first day's winners, Nikolay Davydenko and Novak Djokovic, was their second meeting, after a Davis Cup first round encounter in which Djokovic retired, handing Russia a decisive victory. Davydenko broke in the first service game, holding his advantage until serving at 5–3. Djokovic then broke back, and the set went into a tie-break, which he won, as Davydenko's error count went up during the set decider. The Russian started a comeback, lining up seven straight games to win the second set with a bagel, and lead 1–0 in the third. Djokovic then saved two breaks points, and converted one at 5–5, with Davydenko's unforced errors giving him the break, and eventually the match, on the score of 7–6, 0–6, 7–5. The win meant Tsonga's elimination, and Djokovic's qualification for the semifinals. Day 4 Two more matches of the doubles' Gold Group took place on November 12, with second-seeded Daniel Nestor and Nenad Zimonjić, vying for the year-end No. 1 spot, defeating in straight sets Jonas Björkman and Kevin Ullyett. The Canadian-Serbian team breezed by their opponents, saving all breaks points Björkman and Ullyett held against them, and breaking three times (twice in the first set and once in the second), to score a 6–1, 6–4 victory, the second career win over Björkman and Ullyett, following a close final at the Wimbledon Championships. In the second match, Lukáš Dlouhý and Leander Paes faced Mariusz Fyrstenberg and Marcin Matkowski for the first time, with the Poles taking the close match in straight