Li Na advances in Miami

Li Na has reached the fourth round of the Miami Masters thanks to a straight-sets win over American Madison Keys.

Both players struggled to hold serve during the opening set before Keys moved into a 5-3 lead. However, the youngster was unable to close it out as Li fought back to force the tie-break.

The Australian Open champion then broke twice during the tie-break to claim the set 7-6(3).

The Chinese was broken instantly in the second, but she fought back to seal the victory 6-3 in just under two hours.

Li will now take on either Carla Suarez Navarro or Kaia Kanepi for a place in the quarter-finals.