UPDATE 3-Tennis-Murray beats Djokovic to win Miami title

* Murray dominates first set

* Briton comes back from 5-2 down in second

* Claims third Masters Series title (Writes through)

By Simon Evans

MIAMI, April 5 (Reuters) - Andy Murray won his third ATP title of the year beating Novak Djokovic 6-2 7-5 in the South Florida heat on Sunday to win the Sony Ericsson Open.

Playing intelligent and varied attacking shots allied to his usual impressive defence, the Briton was on top for all but the first part of the second set.

After dominating the first, Murray came back from 5-2 down in the second, the decisive moment coming when he broke Djokovic in the ninth game on a challenged call after the Serb had squandered two set points.

On break point, Djokovic's shot was called out and although he challenged the decision it was upheld, allowing Murray to draw level by holding serve in the next game.

The Scot then came back from 30-0 on Djokovic's serve to break again, having a bit of luck when his return clipped the top of the net and an off-balance Djokovic hit wide.