Rafael Nadal remains perfect in Acapulco

Second-seeded Rafael Nadal remained perfect in matches at the Abierto Mexicano Telcel ATP event in Acapulco, Mexico, by easing past Italian Paolo Lorenzi 6-1, 6-1 in a second-round match Wednesday.

Nadal improved his record to 12-0 at this event, needing only 66 minutes to get past Lorenzi.

Nadal broke Lorenzi's serve five times and lost only five points on his serve, never facing a break point.

Nadal's opponent in the quarterfinals will be Yoshihito Nishioka of Japan, who eliminated Aussie Jordan Thompson 6-4, 3-6, 6-0. Nishioka defeated seventh-seeded Jack Sock in three sets in the first round.

The top seed in the tournament is Novak Djokovic, who played Juan Martin del Potro in a late match Wednesday.

The winner of that match faces Nick Kyrgios of Australia, who defeated Donald Young of the United States 6-2, 6-4.

"I played really well today," Kyrgios said. "I'm really enjoying my time here."

He had no preference regarding his quarterfinal opponent.

"I am looking forward to it," he said. "It doesn't matter who I play. I'll still be aggressive. I'll be excited either way."

American Sam Querrey recorded the biggest upset of the day, eliminating fifth-seeded David Goffin of Belgium 6-2, 6-3 in 69 minutes. Querrey lost only four points on his first serve.

Third-seeded Marin Cilic of Croatia was pushed to three sets but won the critical points to beat 20-year-old Borna Coric of Croatia 6-3, 2-6, 6-3. Cilic, who fired 12 aces, had only two break-point opportunities in the third set but converted both to improve his record against his countryman to 4-0.

Cilic's quarterfinal opponent will be American Steve Johnson, who eliminated Ernesto Escobedo 7-6 (5), 6-3.