The young striker swung in a flawless cross that found Rooney in a surprising amount of his space and the veteran used all his experience to send the ball back across the 'keeper to send Everton into the dressing room a goal to the good.
"On a personal level scoring the winning goal at Goodison Park is a special moment", England's all-time top scorer told broadcasters after the match.
The pair that comes out on top will certainly have a big say in where a potential victory lies, but there will be only so much either duo can do if neither team's forward lines produce the goods where it matters. The early games in the season are always tough because you are always finding your rhythm in games.
The decorated forward's goal was the only moment of note in a tiresome opening period.
"There was one player in an Everton shirt today who was, from the first second to the last, comfortable on the pitch", said the Dutch manager.
That's because the Toffees play Manchester City, Chelsea, Tottenham Hotspur and Manchester United in four of their opening six league games. "That's encouraging for us, we know we're a good side with good players, we just need a little bit more of a cutting edge and that ability to take chances if they are few and far between in games which it was today".
"That's why we signed Wayne, expecting to show his team-mates all that experience and it was really important".
Despite making some high profile signings such as Wayne Rooney and highly-rated defender, Michael Keane, Koeman feels as it's yet not enough to compete with the Premier League's big boys.
But the manager concedes that, for all Everton's shrewd business, it may only allow them to stand still, at least in terms of league position. I think that all bodes well for the games we have ahead of us.
Republic of Ireland midfielder James McCarthy has been left out of Everton's squad for their Premier League opener against Stoke City as he continues his recovery from a knee injury.
"Today a good Stoke team made it hard but it's important you win".
"Like I said, the performance was fine, the result could have been better and based on the performance, I thought we deserved better".
While understanding every team in the Premier League has to face each other, playing quality opponents in such a short space of time, is tough for any side to contend with.
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