Juan Martin Del Potro. Pic/AFP

Sixth seeded Juan Martin Del Potro continued his recent dominance over David Ferrer by beating the Spaniard 6-4, 7-6 (7/3) to reach the fourth round of the ATP Indian Wells tournament here Tuesday. The 29-year-old Del Potro improved to 7-6 overall against Ferrer but has now won five straight, dating back to the 2013 Wimbledon quarter-finals. "We always play tough matches. I got lucky," said the world number eight Del Potro.