1. Sandgren makes Aussie quarters

Unseeded players upset No. 5 Thiem, ailing Djokovic.

The last American man standing at the Australian Open has made it to the quarterfinals. Tennys Sandgren, who upset Stan Wawrinka and Dominic Thiem, had never won a Grand Slam match or beaten a top 10 player before the tournament started.

MELBOURNE, AUSTRALIA — Back-to-back shockers Monday night resulted in a most unexpected Australian Open quarterfinal matchup.

Hyeon Chung, ranked 58th in the world, eliminated an injured Novak Djokovic 7-6 (4), 7-5, 7-6 (3), and American Tennys Sandgren, ranked 97th, defeated fifth-ranked Dominic Thiem 6-2, 4-6, 7-6 (4), 6-7 (7), 6-3.

The two winners will meet on Wednesday.

Defending champion Roger Federer, the second seed, reached the quarterfinals for the 14th time, beating Marton Fucsovics 6-4, 7-6 (3), 6-2. He next will play No. 19 Tomas Berdych, who beat Fabio Fognini 6-1, 6-4, 6-4.

Sandgren, 26, is only the second man in 20 years to reach the quarterfinals in his Australian Open debut. He had never won a Grand Slam match or beaten a top10 player until last week.

He missed a match point in the fourth set but prevailed in the fifth.

“I don’t know if this is a dream or not — all you guys are here, so maybe it’s not,” Sandgren said in an on-court TV interview after his win. “I’m not in my underwear, so maybe it’s not a dream.”

Sandgren converted half of his eight break-point chances and fended off 10 of the 12 he faced. He hit 63 winners against 38 unforced errors.

“Trying to keep riding the wave,” said Sandgren, whose first name is pronounced like “tennis” and belonged to his great-grandfather.

Chung, 21, became the first South Korean to reach the last eight at a Grand Slam. He hit 47 winners and credited six-time Australian champion Djokovic as his inspiration.

“When I’m young, I’m just trying to copy Novak because he’s my idol,” Chung said. “I can’t believe this tonight. Dreams come true tonight.”

Djokovic, playing his first competitive tennis since Wimbledon last July, has altered his service swing because of his injured right elbow. But he winced throughout the match, particularly when stretching for backhands, and needed a medical timeout in the second set for a massage.

He said he would reassess the injury, but didn’t want to detract from Chung’s win.

“Amazing performance,” said Djokovic, seeded 14th. “Whenever he was in trouble, he came up with some unbelievable shots. Just from the back of the court, you know, he was like a wall.”

On the women’s side, No. 1 Simona Halep beat Naomi Osaka 6-3, 6-2. In the quarterfinals she’ll play No. 6 Karolina Pliskova, who defeated No. 20 Barbora Strycova 6-7 (5), 6-3, 6-2.

No. 21 Angelique Kerber recovered for a 4-6, 7-5, 6-1 victory over 88th-ranked Hsieh Su-wei and will meet American Madison Keys.

VINCENT THIAN /AP Tennys Sandgren reacts during his upset of No. 5 Dominic Thiem. He says part of his success has been reining in his emotions.