Returning to Davis Cup tennis, Federer cruised past Ilija Bozoljac, winning 6-4, 7-5, 6-2 in less than two hours. Federer faced little challenge from Bozoljac, who served well but still was no match for his Swiss opponent.
Federer was making his first Davis Cup appearance since 2012.
Bozoljac said he was disappointed about his missed chance to win the second set.
“It was a tough game, he played well,” Wawrinka said. “It’s never easy when you come so late after an important tournament, but I managed to overcome that.”
The second-ranked Djokovic decided to rest after losing to Wawrinka in the Australian Open quarterfinals, while Janko Tipsarevic is nursing a heel injury and Viktor Troicki is serving a 12-month doping ban for failing to appear at a test. That means Lajovic is Serbia’s highest-ranked team member.
The winner plays Belgium or Kazakhstan in the quarterfinals in April.