The Red Bulls took the initiative against the defensive-minded visitors, needing just 12 minutes to break the deadlock. St. Pauli failed to clear the ball out of the area, allowing Yussuf Poulsen to slot home from six meters.
The forward is heading back to the club where he enjoyed four successful years before moving to west London, departing Stamford Bridge for his homeland as a European and world champion.
Both clubs are attempting to reach what would be their biggest match in decades Frankfurt's last final came in 1980, when it won the Europa League's predecessor, the UEFA Cup, and West Ham's last game of that calibre was the 1976 Cup Winner's Cup final.
The result saw Liverpool leaving behind the disappointment of three back-to-back defeats in the Premier League this season.
RB Leipzig knew that only a victory would see them safely through and they made their intention clear right from the opening whistle.
PSG looked to dominate the game from the outset with an early effort from Brazilian striker Neymar cannoning off the post.
RB Leipzig on Thursday defeated Atletico Madrid 2-1 in the quarterfinals of the ongoing UEFA Champions League with Tyler Adams and Dani Olmo scoring.
Adams proved an unlikely hero for Leipzig, coming off the bench to snatch victory in Lisbon after his fired effort took a cruel deflection of Stefan Savic and flew in.
Werner revealed that Lampard made him feel valued as a footballer and as a person which made it easy for him to move to London.
Timo Werner is currently enjoying the best season of his career, having already scored 32 goals and registered 13 assists in 43 appearances in all competitions.
