Kozlov, Mmoh show off quick hands at ATP Challenger

In Tiburon, Calif. at the $100,000 ATP Challenger, a highly entertaining contest between American 18-year-old's Stefan Kozlov and Michael Mmoh produced some slick volley hot shots.

First, while serving to stay in the first set, Mmoh pulled off a delicate drop shot winner from his shoelaces, prompting the sixth-seeded Kozlov to raise his arms in exasperation.

The next two impressive hot shots belonged to Kozlov, before Mmoh sealed the 7-5, 6-4 upset with an overhead. Whoever assumes Americans are simple baseliners haven't seen these two teenagers in action.

In the quarterfinals, Mmoh takes on another American, Bjorn Fratangelo.