Team Serbia celebrate with the ATP Cup trophy after prevailing in the inaugural event.

Team Serbia make a toast in the locker room after beating Team Spain 2-1 in the ATP Cup final.

Viktor Troicki finishes the ATP Cup with a 5-1 record.

Team Serbia is the first country to win the ATP Cup.

Viktor Troicki celebrates with the ATP Cup trophy alongside his Team Serbia teammates.

Team Serbia celebrates on the court at Ken Rosewall Arena after winning the ATP Cup.

Novak Djokovic takes a selfie with his Team Serbia teammates after winning the ATP Cup.

Novak Djokovic and Viktor Troicki face Pablo Carreno Busta/Feliciano Lopez for the ATP Cup title in Sydney

Novak Djokovic and Viktor Troicki clinch a 2-1 tie victory for Team Serbia against Team France.

Novak Djokovic and Viktor Troicki push Serbia to the Final Eight in Sydney.

Former World No. 12 Viktor Troicki beats top seed Benoit Paire on Wednesday in Antalya.

Viktor Troicki defeats Bernard Tomic in three sets to reach the TEB BNP Paribas Istanbul Open second round on Monday.

Hungarian No. 1 Marton Fucsovics and Viktor Troicki attend the 2018 Gazprom Hungarian Open draw ceremony.

Novak Djokovic and Viktor Troicki come up short against Nikola Mektic and Alexander Peya in first-round doubles action in Miami.

Viktor Troicki hones in on a backhand during his first-round match against Denis Shapovalov at the Miami Open presented by Itau on Thursday.

Serbia's Viktor Troicki wins 81 per cent of points behind his first serve to beat Ernests Gulbis at the Diema Xtra Sofia Open on Tuesday.

Viktor Troicki, Gilles Muller and Philippe Kohlschreiber attend the DIEMA XTRA Sofia Open players' party.

Viktor Troicki of Serbia advances to the third round of the Shanghai Rolex Masters on Wednesday with a 6-3, 3-6, 7-6(5) win over Austria's Dominic Thiem.

Serbia's Viktor Troicki celebrates his first Top 10 win of the season on Wednesday in Shanghai.

Milos Raonic, Viktor Troicki, Sam Querrey and Taro Daniel work on producing their Japanese character for 'Samurai' or 'heart'.

Treat Huey, Adil Shamasdin, Viktor Troicki, Milos Raonic, Sam Querrey, Taro Daniel, Ben McLachlan, Go Soeda, Bernard Tomic, Marin Cilic, Adrian Mannarino and Benoit Paire attend the Tokyo player party on Tuesday.

Fabio Fognini and Viktor Troicki took a ride in a horse-drawn carriage through Palace Square on Wednesday.

Thumbs up from Fabio Fognini and Viktor Troicki for a horse-drawn carriage ride in St. Petersburg!

Viktor Troicki wins in two tie-breaks against Andrey Kuznetsov in the St. Petersburg first round.

Viktor Troicki moves past fellow Serbian Laslo Djere to reach the Istanbul semi-finals.