Emma Raducanu reached the Australian Open third round for the first time in her career with a dogged victory over American opponent Amanda Anisimova.

The 22-year-old Briton won 6-3 7-5 after fighting back from breaks down in each set.

Raducanu, ranked 61st in the world, will face Polish second seed Iga Swiatek next.

The 2021 US Open champion's preparations for the opening Grand Slam of the season were hampered by a back injury and she needed treatment twice during the second-round match.

But she managed to find a way to beat Anisimova - a friend who is ranked 35th - in a tussle where there were 13 breaks of serve.

"To make it past the second round means a lot to me," said Raducanu.

"I was able to push past some pain."

After the match, Raducanu said she was on good terms with Andy Murray after her Wimbledon mixed doubles withdrawal before his retirement last year.

She will play five-time Grand Slam champion Swiatek in the last 32 on Saturday.

Swiatek, who has never gone past the Melbourne semi-finals, thrashed Slovakia's Rebecca Sramkova 6-0 6-1 in an hour.

Having pulled out of her season-opening event in Auckland after suffering a back spasm, Raducanu had not played since mid-November before her first-round win over Ekaterina Alexandrova.

Raducanu struggled with her second serve against the Russian 26nd seed, hitting 15 double faults which she put down to a remodelled serve and early tournament nerves.

Another on her first service point against Anisimova was not an encouraging start.

Although she quickly stemmed the flow, Raducanu's serve was regularly punished by the American's explosive hitting.

But Anisimova - who reached the French Open semi-finals as a 17-year-old in 2019 and is re-establishing herself after taking a mental health break from the sport in 2023 - also had issues with her serve and handed over the opening set with a double fault.

At the start of the second set, there were further signs of Raducanu's back issue having an effect.

Afterwards, Raducanu said she had not "fully investigated" whether it was related to the back spasm.

"When you haven't played a match in so long, then to have two really physical ones, I think small niggles are going to come up here and there," she added.

"I'm just hoping that it is that."

After stretching out the area between points, three double faults handed over another break and Raducanu called the trainer when she lost serve again for 3-0.

The physiological, and perhaps psychological, boost helped her immediately.

Raducanu clawed both breaks back to level when she returned, before more treatment between the exchange of another two breaks for 4-4.

Anisimova is a crisp ball-striker but can be erratic, and Raducanu's resistance from the baseline swung a delicately-balanced ninth game her way from 30-30.

Raducanu saved a break point in the 11th game, set up match point in the next with a wonderful crosscourt forehand winner and clinched victory when Anisimova sliced a backhand wide.

"I had to fight hard and not go away even when the chips were down," said Raducanu.

With a day between her matches, Raducanu plans to "take it easy" on Friday.

"I'll probably have a light hit. Nothing crazy," she said.

Fellow Briton Murray was denied a final match at the All England Club last summer when Raducanu pulled out of their first-round mixed doubles match, citing soreness in her wrist.

Murray was known to be disappointed so Raducanu was particularly happy to be congratulated by him after beating Anisimova.

"Afterwards I sent him a long message basically apologising if I caused any trouble, I guess, at Wimbledon, that's definitely the last thing I want," she told the PA news agency.

"He's someone that I've grown up looking up to and I don't want any bad blood or harsh feelings with him.

"I sent him a long message and he took it really well and responded saying he was disappointed but he understood.

"We're fine now. We walk past each other and say, 'hello', 'well done'. It's obviously really cool seeing him with Novak (Djokovic) here as well."