Fans were treated to yet another exhilarating day of tennis at Melbourne Park on Thursday.

A big win for Serena Williams over Mirjana Lucic-Baroni sent her straight to the final against sister Venus who took a three-set win over Coco Vandeweghe.

A bizarre win for Roger Federer - who allowed Stan Wawrinka to take two easy sets and force the game to a fifth set - sent him to the final to face the winner of Friday night's semi final between Rafael Nadal and Grigor Dimitrov.

Here were the talking points from Day 11.

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LUCIC-BARONI'S CHEEKY WILLIAMS SNUB

Mirjana Lucic-Baroni doesn't seem to care who wins the incredible Venus vs Serena Williams final on Saturday, admitting she'll probably be on the plane and well out of the loop.

"Would you believe me if I tell you that I don't care at all?," she said when asked who her favourite for the final was.

"I hope it doesn't sound the way it sounded. I'm sure it's going to be a great final. I'm happy for both Venus and Serena. It's something really special. What they've done, what they've achieved, two sisters, incredible really. It's an incredible story. I'm happy for them. They have that special moment again. It's amazing.

"I'm going to be on a plane, flying home, see my family, get a little bit of rest. So, yeah, I'm done. I'm done. I'm not going to watch."

Lucic-Baroni lost in under an hour against Serena on Day 11, winning only three games throughout the entire match which finished at 6-2 6-1 in Serena's favour.

STAN'S INCREDIBLE RACQUET SMASH

Stan Wawrinka took out his frustration on his racquet late in the second set of his semi-final against Roger Federer, slamming it to the ground after losing a point.
The impact took its toll on his expensive piece of equipment, cracking it up the side and weakening the chassis. Wawrinka was quick to escalate the situation, smashing it over his knee and breaking it clean in two.

"He is a strong fella," Lleyton Hewitt said from the commentary box.

"A little extra anger helps the strength too in that situation."

"What about Federer at the other end, he just watched that going," Todd Woodbridge replied. "Thank you very much."

LEGENDS SLAM FEDERER'S DROP IN FORM

Aussie tennis legends Todd Woodbridge and Lleyton Hewitt were astonished at Roger Federer's failure to convert a brilliant start into a straight sets win over Stan Wawrinka.

Federer dropped two sets in a row, giving his opponent an easy upper hand and forcing the game to a fifth set.

"My thought is that he got ahead of himself and started thinking that he could possibly be in the final," Hewitt said. "We know that for so many years, it came so naturally to him, he didn't think about. As you get older, it is something you may focus on a bit too much."

Todd Woodbridge agreed, saying it was one of the weirdest performances he's seen the Swiss master give after such a dominant start.

"One of the strangest things I have seen in any of his matches over the past 20 years," Woodbridge said. "He had the match in his grasp, his opponent took an injury time, he was up two sets to love. It was more how Roger, his misses, we are not used to seeing him miss so many regulation rally balls."

FEDERER'S INCREDIBLE STATISTIC

Roger Federer knows how to win a match.

The Swiss master has an incredible statistic when it comes to winning the first set of a match. Over his career, Federer has lost only 13 of 290 matches after winning the first set.

Lleyton Hewitt was particularly impressed with the 35-year-old's recovery from injury going into the Open, noting his on-court mobility had returned better than ever.

"It (his movement on the court) is looking as good as ever," he said. "So smooth and I think the break has really helped him as well. He played so many tournaments, so many big matches for so many years. I think it's really freshened him up mentally and physically."

CROWD APPRECIATES BALL BOY'S EFFORT

A ballkid won the crowd over as gun doubles pairing Bob and Mike Bryan played their semi-final against Spaniards Pablo Carreno Busta Guillermo Garcia-Lopez.

In the first set a ball was hit so hard it got lodged between the structure supporting the umpire's seat and the ladder the officials use to get up to their post. The eager ballkid boy ran across and tried to pull it out, but struggled for several seconds.

It looked like the ball wouldn't budge, so one of the players made a move over to help the youngster tasked with retrieving it. But just as he got close, the eager volunteer finally dislodged the ball and the crowd at Rod Laver Arena burst into a rousing round of applause.

"Good man. Good young fella there," Channel Seven's John Fitzgerald said.