BRISBANE, Australia (AP) Angelique Kerber predicted that 2017 was going to have a different feel for her, considering her phenomenal breakout season last year.
It certainly started differently, with the top-ranked German losing to sixth-seeded Elina Svitolina 6-4, 3-6, 6-3 in the Brisbane International quarterfinals on Thursday.
Kerber reached the final here last year and fine-tuned to precision for the Australian Open, where she beat Serena Williams to claim her first Grand Slam title. She went on to reach the finals at Wimbledon and the Olympics before collecting a second major title by winning the U.S. Open. She overhauled Williams for the top ranking and finished the year at No. 1.
After a first-round bye, Kerber struggled with her serve and had nine double-faults in a three-set win over Australian wild-card entry Ash Barty in the second round. Against the No. 14-ranked Svitolina, the German left-hander cut her double-faults down to five, and had a break in the third set after winning the second. But she quickly surrendered the break and wasn't consistent enough, finishing with 48 unforced errors against 39 winners.
''Of course I'm disappointed that I lost here in the quarters (but) I think I'm happy about my start,'' Kerber said. ''I'm not worried about my serve. I know I can improve it, but, I mean, that's the second match of the year, the first tournament.
''It was not a bad match. I think we both play on the really high level tonight ...so, yeah, next.''
Svitolina was the only player to beat both No. 1-ranked women last year, beating Kerber in straight sets in Beijing and Williams at the Olympics. The 22-year-old Ukrainian has now closed the gap to 5-4 in career head-to-head meetings with Kerber.
In the semifinals, she will meet U.S. Open finalist Karolina Pliskova, who advanced by beating eighth-seeded Roberta Vinci 3-6, 6-2, 6-2.
French Open champion Garbine Muguruza rallied from a 4-1 deficit to beat fifth-seeded Svetlana Kuznetsova 7-5, 6-4 to set up a semifinal match against Alize Cornet, who ousted second-seeded Dominika Cibulkova 6-3, 7-5.
Defending men's champion Milos Raonic will face 14-time major champion Rafael Nadal in the quarterfinals. The top-seeded Raonic, who had a first-round bye, had 12 aces in a 6-3, 6-2 win over Diego Schwartzman.
Nadal, who is coming back from months off the tour with a left wrist injury, needed only 55 minutes to finish off a 6-1, 6-1 win over Mischa Zverev in a late match.
''After injuries and hard times, it's so special to be back on court,'' the 30-year-old Nadal told the appreciative crowd at Pat Rafter Arena. ''It means everything to me. When you fight a lot to be back in action, the support of the people means a lot.''
Nadal beat Raonic in an exhibition match last week in Abu Dhabi and has a 6-1 lead in career head-to-head meetings, but the Canadian was still looking forward to facing the Spaniard.
''It's a great task,'' Raonic said. ''I feel like I'm doing a lot of things well and, hopefully, I can match up and play some good tennis.''
Fourth-seeded Dominic Thiem beat Australian wild-card entry Sam Groth 7-6 (5), 6-3 to move into a quarterfinal match against seventh-seeded Grigor Dimitrov, a 6-2, 6-4 winner over Nicolas Mahut.
