Andre Silva headed Eintracht into the lead in the 61st minute off a cross from Filip Kostic, before Ilsanker entered the game in the 81st and made an immediate impact.
Haaland, 19, claimed the first goal in Germany's top flight for two months before Raphael Guerreiro added goals either side of a Thorgan Hazard strike.
Matches will be played behind closed doors and players and coaches, who have been in quarantine for the past week, must follow stringent hygiene guidelines.
With the Premier League, Spain's La Liga and Serie A in Italy all still sidelined by the coronavirus pandemic, the Bundesliga will take centre stage on Saturday.
German football will be blazing a trail among Europe's top leagues by resuming two months after it was halted by the spread of coronavirus, but its strategy is fraught with risks.
Borussia Dortmund to ensure 'highest-possible degree of safety' for players after Bundesliga resumes
Watzke stated that pausing Bundesliga until spectators are allowed back into the stadiums will not be economically viable for the clubs.
Last week, the German Football League (DFL) announced it is ready to resume from May 9, albeit behind closed doors with tight hygiene measures.
Earlier, the league was suspended until April 2 amidst coronavirus pandemic across the globe.
The VAR enjoyed a largely successful debut at the World Cup in Russia, but continues to be the source of much debate and disgruntlement in Germany.
DFL chief Reinhard Rauball wants the Bundesliga clubs to agree to close the transfer window before the season starts.
Bayern host Bayer Leverkusen in the season opener, with the Bavarians the overwhelming favourites to win the title.