Unseeded Spaniard Maria Jose Martinez stunned top seed Caroline Wozniacki to win the Collector Swedish Open in Bastad.

Martinez, ranked 45 places below Wozniacki at 54th in the world, recorded a 7-5 6-4 win in one hour 36 minutes.

The Dane, who celebrated her 19th birthday today, led 4-1 in the second set only for her unheralded opponent to reel off the next five games.

Martinez got just 44% of her first serves in, but proved far more impressive on her opponent's serve as she converted five of her 11 break points to claim victory.