Petersburg's Danielle Collins tops idol Venus Williams at Miami Open

Collins Venus Miami Open

Collins Venus Miami Open

Danielle Collins produced the performance of a lifetime and pulled off an almighty shock at the Miami Open tennis tournament on Wednesday, sending Venus Williams crashing out 6-2, 6-3 to reach the semi-finals.

Azarenka, a three-time victor at this event, coped much the better with the blustery conditions early on but as Stephens' fightback gathered pace, the wildcard's movement looked increasingly laboured as she appeared to struggle with an injury.

It's fitting that Stephens is starting to play at a high level again at the Miami Open. Stephens capitalized on her mistakes and never looked back after that.

In a rematch of last year's round of 16 match at Wimbledon, the French Open champion was too strong for fourth seed Elina Svitolina, running out a deserved 7-6 (7/3) 7-6 (7/5) victor.

She is also going to soar in the world rankings, to no lower than 67th.

2017 US Open champion Sloane Stephens struggled to replicate her success after winning her first Major in NY in September.

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Ostapenko, 20, became the youngest finalist in Miami since Azarenka won the title in 2009 when she was aged 19.

The American may have lost the first set but she won arguably the point of the match in the sixth game with ones of the most incredible defensive displays imaginable.

It was an impressive display by the reigning US Open champion who booked her ticket for Saturday's showpiece with a 3-6, 6-2, 6-1 triumph, just 18 days after beating the Belarusian in straight sets at Indian Wells. Stephens has rediscovered that balance of aggression and defense-lots of running with just enough shotmaking sprinkled in-that, at its best, can leave virtually any of her opponents in the dust. He underlined Ostapenko didn't need to distort her nature, to degenerate her offensive game but just to deliver an off-pace variation sooner or later. She played nearly flawless tennis to snap up four points in a row and allow her opponent just one point, closing it out 7-1. He's played far better in this event with wins over Jiri Vesely, Mikhail Youzhny and No. 2 seed Marin Cilic before taking down the 21-year-old South Korean.

"Before the match I knew that I have to be very aggressive, and when I had a chance, I was going for it", Ostapenko said. "So I knew if I did that in the second I'd be right in there".

"Everything that is special or important to me I keep at my grandparents' house", she said, a big, toothy smile emerging from beneath her baseball cap.