The latest from the Australian Open on Saturday (all times local):

3:45 p.m.

John Isner has aced his way back into the round of 16 at Melbourne Park, avenging a loss to 18th-seeded Feliciano Lopez in the same round on the same court four years ago.

The 10th-seeded Isner had three of his 44 aces in the last game to clinch a 6-7 (8), 7-6 (5), 6-2, 6-4 win over Lopez. Isner leads the tournament with 101 aces in three matches.

Lopez knocked Isner out of the Australian Open in a five-set, third-round match at Hisense Arena in 2012. Isner has only made the round of 16 at the tournament once before, in 2010.

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2:45 p.m.

Milos Raonic has dedicated his third-round victory at the Australian Open to victims of a shooting in Canada which left four people dead and at least two injured.

A gunman opened fire at the La Loche Community School in a remote aboriginal community in Saskatchewan, and at a second location.

After his win over Viktor Troicki on Saturday, the 25-year-old Canadian said, "Today, before I stepped out on court it was a difficult day back home."

His voice sounding emotional at times, Raonic added: "Unfortunately in Saskatchewan in a very small community there was a shooting at a high school, so I want to take a moment and give thoughts to that community. Today's victory was for that community, and a quick recovery and all of Canada, and I'm sure the world is behind you."

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2:30 p.m.

No. 13-seeded Milos Raonic has reached the fourth round at Melbourne Park for the fourth time, defeating Viktor Troicki 6-2, 6-3, 6-4 to advance.

Raonic trailed 4-1 in the third set before winning five consecutive games and the match. He set up match point with an ace, his 14th of the match, and clinched it when No. 21 Troicki hit a forehand long.

The match pitted the winners of the two Australian Open warmup tournaments — Raonic beat Roger Federer for the Brisbane International title and Troicki defeated Grigor Dimitrov in Sydney.

Last year as the No. 8-seeded player, Raonic had his best Australian Open result by reaching the quarterfinals and losing to eventual champion Novak Djokovic.

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2 p.m.

Victoria Azarenka has cruised into the fourth round with another quick victory, dispatching Japanese qualifier Naomi Osaka 6-1, 6-1 in 56 minutes.

The two-time Australian Open champion, seeded 14th this year, has lost just five games in three matches so far at Melbourne Park.

Azarenka had 24 winners to only four for Osaka, who was making her Grand Slam main draw debut.

Azarenka said after the match, "It wasn't easy for sure, especially when you don't know who you play. ... She's a little unpredictable and she surprised me with her game."

Azarenka next faces Barbora Strycova, a straight-sets winner over the No. 3 seed, Garbine Muguruza earlier Saturday.

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12:35 p.m.

Third-seeded Garbine Muguruza has become the latest casualty in the women's draw at Melbourne Park, beaten by Barbora Strycova 6-3, 6-2 in the day's first match on Rod Laver Arena.

Muguruza misfired frequently on her groundstrokes, finishing with 32 unforced errors, and looked a bit listless throughout the match.

Since reaching last year's Wimbledon final, the Spanish player has lost in the second round of the U.S. Open and now the third round at Melbourne Park.

Strycova has only been past the third round once before in 38 Grand Slam appearances when she reached the quarterfinals of Wimbledon in 2014.

No. 2 Simona Halep, No. 6 Petra Kvitova and No. 8 Venus Williams have also been eliminated from the tournament.

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12:25 p.m.

Johanna Konta has become the first British woman to reach the fourth round at the Australian Open in 29 years.

Konta beat No. 8 Venus Williams in straight sets in the first round and on Saturday had another straight-sets win over Denisa Allertova, 6-2, 6-2.

The 47th-ranked Konta is making her debut in the main draw at Melbourne Park but has shown few jitters and a fighting spirit as she moves through the draw.

Konta said she knew what to expect from Allertova, who stretched her to three sets in the first round at last year's French Open.

The 22-year-old Konta was born in Australia and became a British citizen in 2012, making her the first British woman to reach the round of 16 at Melbourne Park since Jo Durie in 1987.