Los Angeles: Juan Martin del Potro battled back in the second set to beat James Blake 6-4, 7-6 (3) on Wednesday to reach the quarter-finals of the Farmers Classic.
The No. 2 seed and Blake traded the final eight games of the set, leading to the decisive tie-break. Del Potro took control from there and won when Blake was unable to return his serve.
Del Potro, the 2008 tournament champion, is still working his way back from wrist surgery last year that derailed his season. He is ranked 19th in the world after dropping as low as No. 484 in February.