Tennis: Del Potro edges Federer in 3 sets to win Indian Wells title

Juan Martin del Potro, of Argentina, returns a shot to Roger Federer, of Switzerland, during the men's final at the BNP Paribas Open tennis tournament, Sunday, March 18, 2018, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

INDIAN WELLS, Calif. — Juan Martin del Potro keeps surprising himself.