Del Potro beats Opelka in 2nd round at Delray Beach
Peter Staples/ATP World Tour / ATP World Tour / Getty

DELRAY BEACH, Fla. (AP) Top-seeded Juan Martin del Potro never faced a break point and won his second-round match Thursday night at the Delray Beach Open, beating American Reilly Opelka 6-4, 6-4.

Del Potro overcame 18 aces by Opelka and will next face American Mackenzie McDonald, who beat Guillermo Garcia-Lopez 7-5, 6-4.

Del Potro is playing his first event after missing four months because of a knee injury. He won the tournament in 2011.

No. 4 Steve Johnson reached the third round by beating Paolo Lorenzi 7-5, 7-5. Nick Kyrgios lost to Radu Albot 6-2, 3-6, 6-3.

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Del Potro beats Opelka in 2nd round at Delray Beach
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