Australian Open sees more upsets on Day 4

Muguruza, Konta out as mercury soars

MELBOURNE, Australia — Wimbledon champion Garbine Muguruza struggled with the heat and Hsieh Su-wei’s game before losing 7-6 (1), 6-4 on Day 4 as the upsets intensified at the Australian Open.

No. 3-ranked Muguruza follows Venus Williams and U.S. Open champion Sloane Stephens out of the tournament in the first week, leaving only three major winners still in the women’s draw.

Muguruza had five double-faults, including one to give No. 88ranked Hsieh a match point, and made 43 unforced errors. She needed a medical time out in the first set, and accidentally hit a ball into a line judge in frustration.

The 32-year-old Hsieh is a former top-ranked doubles player who had only one previous win over a top-10 player and whose careerhigh singles ranking peaked at 23 in 2013.

With a forecast high of 39 C, Maria Sharapova appeared to be in a hurry to get off the Rod Laver Arena court ASAP, winning the first set in 23 minutes.

The five-time major winner advanced 6-1, 7-6 (4) over No. 14-seeded Anastasija Sevastova.

Ninth-seeded Johanna Konta, the 2016 Australian Open semifinalist, fended off three match points before losing to U.S. lucky loser Bernarda Pera 6-4, 7-5.

No. 123-ranked Pera is making her Grand Slam debut and, after losing in the last round of qualifying, didn’t even know she had a spot in the main draw until Margarita Gasparyan withdrew with an injury.

Pera will next play No. 20 Barbora Strycova, who beat Lara Arruabarrena 6-3, 6-4.

Also advancing were No. 8 Caroline Garcia and No. 26 Agnieszka Radwanska, who next plays Hsieh.

Lauren Davis beat Andrea Petkovic 4-6, 6-0, 6-0 and has a potential third-round match against top-ranked Simon Halep, who was playing Eugenie Bouchard later Thursday.

Former No. 1-ranked Karolina Pliskova advanced to a thirdround match against No. 29 Lucie Safarova.

Sam Querrey was the latest of the leading U.S. men eliminated when he lost his second-round match 6-4, 7-6 (6), 4-6, 6-2 to 80thranked Marton Fucsovics. No. 8 Jack Sock and No. 16 John Isner went out in the first round.

The 13th-seeded Querrey was one of 10 American players — men and women — to reach the second round from the 32 who started the main draws.

No. 5 Dominic Thiem rallied from two sets down to defeat 190thranked American qualifier Denis Kudla 6-7 (6), 3-6, 6-3, 6-2, 6-3. No. 21 Albert Ramos beat another American, wild-card entry Tim Smyczek 6-4, 6-2, 7-6 (2).

No. 19 Tomas Berdych beat Guillermo Garcia-Lopez in four sets.