"This is what the Davis Cup is all about", said Serbia captain Nenad Zimonjic, who is without his three leading singles players - Djokovic, who is sidelined until 2018 with a wrist injury, Janko Tipsarevic and Viktor Troicki.
One player who thrives off of the Davis Cup pressure is Australia's Nick Kyrgios.
The last time Australia reached the final, Lleyton Hewitt, the current team captain, was in his prime and fittingly, he will oversee the country's best chance of adding to its 28 titles in over a decade.
In recent times, Belgium has had the wood on Australia - winning on both clay and hardcourt in 2007 and 2010.
David Goffin, like Kyrgios, performs well in Davis Cup so if the two meet in the 4th rubber on Sunday, it would definitely be worth watching.
Ruben Bemelmans and Arthur De Greef will represent Belgium against Australians John Peers and Jordan Thompson. World no 185 Millman, in for Thanasi Kokkinakis, was no match for Goffin's power as the more experienced man came through to eventually triumph 6-7 (4-7) 6-4 6-3 7-5.
Kyrgios appears to be over the shoulder injury which short-circuited his US Open campaign, and a 3-0 head-to-head record against Belgian no.1 Goffin augurs well for the Aussie no.1.
Though Kyrgios has had a tumultuous 2017 as a singles competitor, the 22-year-old Canberran has delivered the goods during the premier worldwide team event in men's tennis. Accompanying Kyrgios on the opening day of singles action will be his conqueror at the U.S Open, John Millman.
Nick Kyrgios recovered from two sets to one down against Steve Darcis to pull Australia level at 1-1 in the Davis Cup semi-final against Belgium.
Despite his strong form on the world stage, Peers was overlooked by a succession of Davis Cup captains until Hewitt took over and gave him his debut against the US previous year.
Speaking to the playersvoice.com.au website, Kyrgios said the contradictory messages sent out by Tomic left him scratching his head. That week in Perth, Australia, he went undefeated in singles matches including wins over Alexandr Dolgopolov, Alexander Zverev, and Andy Murray.
In the other semifinal in Brussels, David Goffin produced a hard-fought win against Australian John Millman to earn the hosts an early lead.
In the second rubber, Steve Darcis gave Kyrgios all he could handle early and even took the lead after a close third set, coming from behind to win the tie-break.