WRAPUP 1-HIGHLIGHTS-Tennis-Day four at the Australian Open

World number one Rafa Nadal progressed to the third round of the Australian Open on Thursday but conceded he could have been more clinical in a straight-sets victory over Argentina's Federico Delbonis. The Spaniard, bidding for a record-equalling 20th Grand Slam title, converted just three of his 20 break point opportunities in a 6-3 7-6(4) 6-1 victory.

"I think I can do a lot of things better. But it's not because of Delbonis. I can do things better because of myself. I need to play better," said Nadal. There were difficult five-set wins for Dominic Thiem and Karen Khachanov and former champion Stan Wawrinka, before home favorite Nick Kyrgios entertained the crowd in a packed Melbourne Arena.

Kyrgios overcame Frenchman Gilles Simon 6-2 6-4 4-6 7-5 in a match where both players mimicked Nadal's service routine after they were handed time violations. Karolina Pliskova, Belinda Bencic, and Elina Svitolina recorded comfortable wins as all of the top 10 seeded players in the women's draw advanced to the third round in Melbourne for the first time since 2007.

Highlights of the fourth day at the Australian Open, the first Grand Slam tournament of the year, on Wednesday (times AEST; GMT+11): READ MORE

Nadal dominates Delbonis to ease into third round Zverev enjoying blending into the crowd

Kyrgios stays away from 'dark place' against Simon to advance Cahill offers Halep donation discount for reaching Melbourne third round

Thiem rallies to unlock Bolt, reach third round Kilimanjaro climb inspires Muguruza

Pliskova wins 'ugly match' to advance Medvedev masters Martinez, bleeding nose

Injury cuts short Grand Slam return for Mirza Gauff vows to be more aggressive against Osaka

Australian Open order of play on Friday 0050 SVITOLINA STROLLS INTO ROUND THREE

Fifth seed Elina Svitolina racked up 31 winners on her way to a comfortable 6-2 7-6(6) win over American Lauren Davis.

2330 NADAL MAKES SMOOTH PROGRESS

Top seed Rafa Nadal, chasing his first Australian Open title since 2009, powered past Argentine Federico Delbonis 6-3 7-6(4) 6-1 to reach the third round at Melbourne Park.

2200 KYRGIOS PASSES TRICKY TEST AGAINST SIMON

Home favorite Nick Kyrgios overcame a lapse in concentration in the third set to beat France's Gilles Simon 6-2 6-4 4-6 7-5. Kyrgios, seeded 23rd, wrapped up the match with his 28th ace.

2034 HALEP SEES OFF DART Romania's Simona Halep, the 2018 runner-up, endured a nervy time against British qualifier Harriet Dart before sealing a 6-2 6-4 win for the 90th Grand Slam main draw victory of her career.

1802 ZVEREV GETS PAST GERASIMOV, THIEM DOWNS BOLT

German seventh seed Alexander Zverev moved into the third round of the Australian Open for the fourth straight year with a 7-6(5) 6-4 7-5 victory over Egor Gerasimov.

Fifth seed Dominic Thiem of Austria recovered from a mid-match blip to overcome Australian wildcard Alex Bolt 6-2 5-7 6-7(5) 6-1 6-2.

1749 MEDVEDEV SAYS UNDERARM SERVE CAN BE USEFUL

Russia's Daniil Medvedev said the underarm serve can be a useful weapon when executed correctly after Spanish qualifier Pedro Martinez unsuccessfully tried to catch him off guard on Thursday. "When Nick (Kyrgios) started doing it, people were, like, 'it's disrespectful for me, it's not for me'," U.S. Open runner-up Daniil Medvedev said after easing past Martinez 7-5 6-1 6-3 and reach the third round.

"It's one of the shots which he can use good sometimes. We saw some players do it last year when they're right, because, it's easy to put the ball in like this... I just need to be ready for it sometimes and try to win the point."

1700 INJURY-FREE BELLIS STUNS MUCHOVA

American 20-year-old Catherine Bellis, who recovered from multiple arm surgeries and returned to the WTA Tour in November after 20 months out, upset Czech 20th seed Karolina Muchova 6-4 6-4 to reach the third round. She was joined by 17th seed Angelique Kerber who dispatched Australian wildcard Priscilla Hon 6-3 6-2.

1515 PLISKOVA TOO GOOD FOR SIEGMUND

Czech second seed Karolina Pliskova made short work of Germany's Laura Siegemund, firing eight aces and 22 winners to seal a 6-3 6-3 victory.

1451 PLAY RESUMES ON OUTER COURTS

Play got underway on the outside courts following a spell of rain.

1347 MUGURUZA RALLIES PAST TOMLJANOVIC

Spain's Garbine Muguruza blasted 34 winners as she quelled the challenge of local hope Ajla Tomljanovic 6-3 3-6 6-3 on Rod Laver Arena.

Play on the outside courts at Melbourne Park was suspended due to heavy rain.

1301 BENCIC MARCHES INTO THIRD ROUND

Swiss Belinda Bencic came through a tricky clash with former French Open winner Jelena Ostapenko, winning seven out of eight break points to prevail 7-5 7-5.

1100 PLAY DELAYED BY RAIN

Morning rain delayed play on the outside courts for at least an hour but matches at the roofed show courts proceeded only slightly behind schedule. After a hot, gusty day on Wednesday, the weather forecast was for a cooler day of 21 degrees Celsius (70F) but with breezy conditions still to test players at Melbourne Park.