( CNN ) -- Juan Martin Del Potro is confident he can return to his best form in a month after crashing to a 6-3 6-0 defeat against Spain 's Feliciano Lopez in the first round of the Japan Open . Del Potro is still working his way back to full fitness after an eight-month absence with a wrist injury , and world number six Lopez took just 82 minutes to dispose of the Argentinean . Speaking to the ATP World Tour website , the 22-year-old said : `` It is difficult to come back and play against these players , especially Feliciano on such a fast court . `` I need time , I need to work on a few things to get back to my best level . If I work in a good way , I will be in good shape in a month or so . '' Elsewhere in the draw , Russia 's Dmitri Tursunov earned an impressive win over seventh-seed Ernests Gulbis , defeating the Latvian in straight sets 6-3 6-4 . Tursunov did not suffer one break of serve in the match , completing his victory in a swift 72 minutes . On the women 's tour , Jelena Jankovic suffered a shock defeat at the China Open , going down 6-2 2-6 6-2 against fellow Serb Bojana Jovanovski . It was a disappointing result for the third seed , who exited in the second round alongside Agnieszka Radwanska . Radwanska lost 5-7 7-6 7-5 in a hard-fought match against Angelique Kerber of Germany .
Juan Martin Del Potro is out of the Japan Open in Tokyo . He was defeated by Spain 's Feliciano Lopez 6-3 6-0 . TL;DR Rafael Nadal wins his first title at Indian Wells since 2009.