Li Na sees off Melinda Czink challenge

China's Li Na has booked her place in round three of the Sony Ericsson Open in Miami, Florida, after she saw off the challenge of Hungary's Melinda Czink in straight sets.

In a tough opening set, Czink drew first blood when she broke her opponent's serve on her way to a 4-2 lead.

However, the world number eight hit back instantly as she took two service games from the world number 124.

Despite a further break from the plucky Czink, Li Na grabbed a vital third service break before she served out the set 7-5.

It was far more straightforward for China's number one in the second as she ground out two breaks of serve to claim the set 6-2.