"Obviously we had an uphill battle this morning, but we believed in our hearts we could do this," Donald told BBC Sport. "It was my job to lead us off. Fortunately I played great today and the other guys just followed.
"It's one of the highlights of my career. It's been down to a lot of people, but Jose has been a calming influence."
Donald won two and lost two of his matches over the course of the weekend.