Alexander Zverev failed in the second round at the Australian Open.

The 25-year-old Olympic champion lost his duel with world number 107 on his Grand Slam comeback in Melbourne.

Michael Mmoh from the USA 7: 6 (7: 1), 4: 6, 3: 6, 2: 6 and presented himself far from his best form.

Zverev missed his seventh third round entry in Australia in a row.

After a good start to the match, he was no longer able to show dominance from the second set and his opponent, who had moved into the main draw as a so-called lucky loser, took his chance.

Zverev started the tournament with low expectations and won a five-set win against Peruvian Juan Pablo Varillas in the first round.

It was his first win since the serious ankle injury he sustained in the French Open semifinals against Rafael Nadal in early June.

Doubles player Andreas Mies reached the second round in his first Grand Slam appearance with his new partner John Peers.

The two-time French Open winner won alongside the Australian against the Indians Yuki Bhambri and Saketh Myneni 7: 6 (7: 5), 6: 7 (4: 7), 6: 3.

Last November, Mies announced the separation from his long-time successful partner Kevin Krawietz, with whom he won the Grand Slam title in Paris in 2019 and 2020.

Krawietz also has a new doubles partner in Tim Pütz, but he is absent in Melbourne because his child is about to be born.

Pütz meanwhile competed with Frenchman Nicolas Mahut, the duo lost in the first round.

Siegemund goes on

Meanwhile, Laura Siegemund has reached the third round.

The 34-year-old won her match against the number 27 seeded Romanian Irina-Camelia Begu 5: 7, 7: 5, 6: 3.

Siegemund made it into the third round of the Grand Slam tournament at Melbourne Park for the first time since her debut in 2016.

The four other German starters had already failed at the opening hurdle.

The next opponents waiting for Siegemund are Caroline Garcia from France, who is number four, or Leylah Fernandez from Canada.

Siegemund got off to a good start and was a break ahead, but still had to give up the first set.

In the equally balanced second round, the Metzingerin kept her nerves this time.

In the third set, she also benefited from an apparent foot injury from her opponent.

Due to the wind, conditions were difficult at Melbourne Park's uncovered 8th pitch.

Ruud fails

Norway's tennis star Casper Ruud surprisingly failed in the second round.

Last year's finalist of the US Open and French Open was beaten by the American Jenson Brooksby 3: 6, 5: 7, 7: 6 (7: 4), 2: 6 on Thursday.

After the top seeded Spaniard Rafael Nadal, who lost in the second round on Wednesday, the number two of the first Grand Slam tournament of the year was eliminated.

Nadal expects six to eight weeks of downtime following his injury.

The 36-year-old announced this in a statement on social media on Thursday.

The MRI scan revealed second-degree damage to the iliopsoas muscle, the main muscle involved in hip flexion in the groin, in his left leg.

Now the time for "sports rest and anti-inflammatory physiotherapy" has come, Nadal wrote.

Immediately after his three-set loss to USA's Mackenzie McDonald on Wednesday when he injured himself on a long stride, Nadal had left his future open.

It is "tiring and frustrating" that "a large part" of his career consists of fighting back from injuries.

He must avoid a longer break because of the current hip injury, "because if not," said the 22-time Grand Slam tournament winner, "it will be difficult".