Pospisil sees of Del Potro
Canada's Vasek Pospisil saw off the challenge of Juan Martin Del Potro to book his place in the second round of the Miami Open.
Pospisil claimed a 6-4 7-6 (9/7) win over the Argentinian, who was making his return after suffering a wrist injury that had seen him ruled out since January.
In the women's event, seventh seed Agnieszka Radwanska beat Anna Schmiedlova 6-4 7-5 in the second round while France's Alize Cornet defeated Elena Vesnina 6-4 6-1.
Ninth seed Andrea Petkovic eased into the third round thanks to a 6-2 6-2 victory against Christina McHale.