The German made several excellent saves to earn a clean sheet.
Aubameyang said: "I think he had a really, really good game against Tottenham and today again as well he did the same. He's doing very well and we know that Leno is a great goalkeeper. That's important for us to have a clean sheet today."
On the top four battle, he added: "Of course it's in our hands, but we know that games are not easy. No matter who you play it's always difficult in the Premier League, but everything is in our hands and we will try our best to stay in the top four and go to the Champions League."