Mislav Orsic and Erling Haaland scored hat-tricks on their Champions League debuts, marking the first time two players have done so in the same edition of the competition.
Croatian attacker Orsic, 26, notched his treble in Dinamo Zagreb's 4-0 home win over Atalanta on Wednesday.
The result put Dinamo top of Group C, which also has Shakhtar Donetsk and Manchester City.
Orsic's exploits followed 19-year-old Salzburg striker Haaland netting three times in a 6-2 victory over Belgian side Genk on Tuesday.
Salzburg is top of Group E ahead of Napoli and Liverpool.
Keen to carry momentum
Orsic is keen to ensure the side carries momentum from the opening triumph.
"This is the best ever Dinamo Zagreb performance in the Champions League and Europa League," he said.
"But this is a small step for us, we need to continue this way and see if we can achieve something big.
"We played a really good game, it was an excellent performance. We changed the formation for this match and I think we caught the opponents by surprise."
Craziest thing done in life
Haaland's treble also saw him become only the eighth player to score three times on debut in Europe's elite competition.
"This is the craziest thing I've ever done in my life," Haaland – who scored 11 league goals heading into the match – said after the Group E opener at Stadio Salzburg.
"The fans today, oh my god. I had goosebumps as soon as I stepped onto the field and I still have. This feeling in my body I never had before."
After crushing Belgian visitor Genk, Haaland does not believe it is impossible for Salzburg to follow in the footsteps of Dutch champion Ajax, which reached the semi-finals last season.
"Everything is possible. We all saw Ajax last year, it would be nice to be the new Ajax," he told UEFA.com . "But we know there are lot of good teams. It's hard, but everything is possible."
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