In March 2009, Troicki played for the Serbian Davis Cup team, losing to David Ferrer 0–6, 3–6. He then competed in the next four Masters Series. In the BNP Paribas Open, he lost to David Nalbandian in the third round 4–6, 2–6. In the Miami Masters, he reached the fourth round before Andy Murray defeated him 6–1, 6–0. He then lost in the first round to Stan Wawrinka in the Monte Carlo Masters, and in the Rome Masters to Juan Martín del Potro in the second round. Viktor competed in the first tournament of his home nation in the Serbia Open, losing to compatriot Novak Djokovic. In the Madrid Masters, he lost to Nikolay Davydenko 2–6, 2–6, in the opener. He then represented Serbia in the ARAG World Team Cup, helping Serbia to win the title by beating Rainer Schüttler in the finals. In the French Open, he lost to fifth seed and eventual semifinalist Juan Martín del Potro in the second round 3–6, 5–7, 0–6, after defeating Łukasz Kubot in a tight five-setter 3–6, 6–3, 6–4, 6–7, 6–3, a match that lasted 3 hours and 58 minutes.