Novak and Viktor both won on the opening day at Kraljevo Sports Centre to give Serbia a 2-0 lead over Croatia going into Saturday’s doubles.
Kraljevo, Day 1: 13.00 CET Novak Djokovic (SRB) vs Mate Delic (CRO), followed by Viktor Troicki (SRB) vs Borna Coric (CRO).
Novak will lead the 2010 Davis Cup champion Serbia in Kraljevo (6-8 March). He will be joined by Troicki, Krajinovic and Zimonjic.
Novak was attempting to win his 50th career title and second in 2015. Roger Federer won 6-3, 7-5 to take his seventh Dubai crown.
Novak will attempt to clinch his 50th tour-level title and his second of the year, when he takes on second seed Roger Federer on Saturday.
Nole needed just 49 minutes to beat Marsel Ilhan of Turkey 6-1, 6-1 in quarter-final action on Thursday.
Novak stayed on course for a fifth Dubai Duty Free Tennis Championships crown after ousting Andrey Golubev 6-1, 6-2 on Wednesday.
The top seed opened his bid for a fifth Dubai Duty Free Tennis Championships title with a 6-4, 6-4 victory over Vasek Pospisil on Tuesday.
Novak is making his ninth appearance at the Dubai Duty Free Tennis Championships (30-4 record), aiming for his fifth crown.
Four of the top 10 men are in the field. Along with Novak, a stellar line-up also features Federer, Murray and Berdych.
12.03. - 22.03.2015.
Indian Wells, USA