Nishikori overcomes sluggish start to advance in Argentina

Italy's Paolo Lorenzi returns the ball to Argentina's Carlos Berlocq during the Davis Cup first round tennis match in Buenos Aires, Argentina, Sunday, Feb. 5, 2017. (AP Photo/Natacha Pisarenko)

BUENOS AIRES, Argentina (AP) Top-seeded Kei Nishikori overcame a slow start to beat local favorite Diego Schwartzman 5-7, 6-2, 6-2 in a second-round match Wednesday at the Argentina Open.

Nishikori, No. 5 in the ATP rankings, needed 2 hours, 6 minutes to advance. The Japanese star will next play Joao Sousa of Portugal in the quarterfinals.

Earlier, Gerald Melzer of Austria upset eighth-seeded Paolo Lorenzi of Italy 6-3, 6-3 in the first round.

And No. 5 Albert Ramos-Vinolas advanced in his second-round match when Argentina’s unseeded Leonardo Mayer retired in the third set with an injury. Ramos-Vinolas was leading 6-7 (4), 7-6 (3), 1-0.