Cahill, who scored one of the best goals at the 2014 World Cup finals with a cracking volley against the Dutch, could also break the 50-goal mark for Australia in Russian Federation.
Along with Germany and Australia, Group B includes Chile and Cameroon, which played their match on Sunday.
The goals were scored by Germany's Lars Stindl (5th minute), Julian Draxler (44th minute, penalty shoot-out) and Leon Goretzka (48th minute), and Australia's Tom Rogic (41st minute) and Tomi Juric (56th minute).
However, the Socceroos have arrived in Russian Federation on the back of a narrow World Cup qualifying win over Saudi Arabia and a hammering by Brazil.
Germany coach Joachim Loew has as a result brought a young team to Russian Federation, and the players on the journey are eager to prove themselves ahead of next year's World Cup. And while the players might cross into the fantasy world across the road to try the extreme rides, they can't afford to ease up on the pitch if they are to return to Russian Federation.
"We were losing our thread, our attacks were not as consistent and we weren't single-minded", Loew said.
"Because we want to continue to evolve as a team and we want to do well here", he said.
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Australia almost snatched an equaliser in the 81st minute but goalkeeper, Bernd Leno rushed off his line to deny Juric. "So in the second half, Australia had a bit more possession but I didn't think they had a lot of opportunities and chances".
Joachim Low's squad have been preparing with a handful of unusual drills, while Socceroos great Tim Cahill has been drawing inspiration from his finest goal on the worldwide stage.
Mark Donaldson and Alejandro Moreno dissect Joachim Low's much-changed Germany side after a narrow win over Australia.
"It's disappointing, we were barely clinging on in the first half", admitted Socceroos coach Ange Postecoglou.
Germany's rawness wasn't obvious at all early in the game when a goal was created after only five minutes. The oldest tried to join him by also scoring his first tournament goal, but Sandro Wagner's diving header was off target.
The German's arrive in Russian Federation with an unblemished 100 per cent record in their World Cup qualifying group - winning all six games, scoring 27 and conceding just once.
Die Mannschaft's two brightest performers Joshua Kimmich and Goretzka combined to make it 3-1 three minutes into the second half as the former's delicious through ball was blasted in by the Schalke midfielder.
And Germany extended their lead with a copybook move on 48 minutes.