After the Radek Stepanek match, Novak Djokovic challenges McEnroe to come play with him in Ashe Stadium. McEnroe accepts. Before McEnroe arrives, Djokovic performs for the crowd his imitation of McEnroe. 2009 US Open, Labor Day. For a video of him playing McEnroe just afterwards, see http://www.youtube.com/watch?v=PopBYV6LgyE