MELBOURNE, Australia (AP) — Serena Williams wore a fitted pink blazer into her second-round match at the Australian Open, giving the impression she wasn’t feeling the heat.

And after her 6-1, 6-2 win over Vesna Dolonc yesterday, the second consecutive scorching day at the season’s first major, Williams said she could remember hotter matches.

By improving her career mark to 60-8 at Melbourne Park, she equalled Margaret Court’s record 60 match wins at the Australian Open in the Open era.

On day three at Melbourne Park, the centre court at Rod Laver Arena was — at least according to the two fans holding up a sign — “Serena’s Arena”.

The heat topped 40 Celsius (104F) during the 63-minute match, and peaked at just under 42 C (108 F) later during Novak Djokovic’s 6-0, 6-4, 6-4 win over Leonardo Mayer. Second-seeded Djokovic, aiming to be the first man in the Open era to win four consecutive Australian Open titles, didn’t face a break point.

Williams fended off the only break point she faced with an ace, one of her 10 in the match. She hit 24 winners, sticking to the ideal strategy of keeping the points short on a hot day and extended her winning streak to 24 matches.

Williams next meets number 31-seeded Daniela Hantuchova, who was on court for 3 hours, 13 minutes in her 6-3, 3-6, 12-10 win over Karolina Pliskova.

Temperatures topped 42 Celsius (108F) on Tuesday, and there were a total of nine retirements in the first round, equalling a Grand Slam record. It wasn’t quite as stifling yesterday, but the forecast is for the heat wave to continue until Friday.

Li Na, the 2011 French Open champion and a two-time finalist at Melbourne Park, had a 6-0, 7-6 (5) win over 16-year-old Belinda Bencic and will next play number 26 Lucie Safarova in the third round.

Number nine Angelique Kerber advanced and will next meet American Alison Riske, who trounced Yanina Wickmayer 6-1, 6-1. Australian wild-card entry Casey Dellacqua upset number 18 Kirsten Flipkens 6-3, 6-0.

Number 17 Sam Stosur is through to the third round of her home Grand Slam for the first time in three years after a 6-2, 6-0 win over Tsvetana Pironkova. Number 30 Eugenie Bouchard of Canada beat Virginie Razzano 6-2, 7-6 (10) and Zheng Jie defeated American Madison Keys 7-6 (5), 1-6, 7-5.

Stosur will face former French Open champion Ana Ivanovic in the third round after the Serbian player beat Annika Beck of Germany 6-1, 6-2. The Stosur-Ivanovic winner could face Williams in the round of 16.

The tournament’s heat rule went into effect in the first match on Margaret Court Arena, giving number 15-seeded Sabine Lisicki and Monica Niculescu a 10-minute break after the second set. Niculescu won 2-6, 6-2, 6-2 and will next play number 22 Ekaterina Makarova, who followed up her win over Venus Williams with a 6-2, 7-5 victory over American Irina Falconi.

Djokovic had a brief scare while serving at 3-0 in the first set when he turned over on his left ankle, tumbling to the court.

Number three David Ferrer beat Adrian Mannarino of France 7-6 (2), 5-7, 6-0, 6-3 to advance along with number seven Tomas Berdych and number nine Richard Gasquet, number 17 Tommy Robredo, number 20 Jerzy Janowicz and number 29 Jeremy Chardy.

In late-finishing matches, eighth-seeded Stanislas Wawrinka beat Alejandro Falla of Colombia 6-3, 6-3, 6-7 (4), 6-4, number 15 Fabio Fognini beat Jarkko Nieminen 7-5, 6-4, 3-6, 6-2 and number 28 Vasek Pospisil of Canada overcame a back injury with the help of painkillers during the match to beat Australia’s Matt Ebden 3-6, 7-6 (6), 7-6 (9), 6-1.

Florian Mayer beat number 14 Mikhail Youzhny, Uzbekistan’s Denis Istomin defeated number 30 Dmitry Tursunov and Bosnian qualifier Damir Dzumhur advanced when number 32-seeded Ivan Dodig retired with cramps while leading in the fourth set.

Sam Querrey fired 19 aces, saying he had “one of the best service days of my life” in a 6-2, 6-3, 6-4 upset win over number 23 Ernests Gulbis.