Novak Djokovic feels he has "something extra" at this year's Australian Open as he prepares to do battle for a place in the Melbourne final.
Nine-time champion Djokovic hopes to reach a 10th final at Melbourne Park when he takes on American Tommy Paul in the last four on Friday.
For Paul, it marks a maiden Grand Slam semi-final, in which he will face Djokovic for the first time.
Earlier in the day, third seed Stefanos Tsitsipas will meet Karen Khachanov.

Greece's Tsitsipas is chasing a place in his second major final when he takes on Khachanov on Rod Laver Arena from 03:30 GMT, while his Russian opponent has never progressed from a Grand Slam semi-final.
Fourth seed Djokovic and Paul will go head to head from 08:30.
Elsewhere, Britain's Alfie Hewett and Gordon Reid chase a fourth successive wheelchair doubles title when they take on Dutch duo Maikel Scheffers and Ruben Spaargaren in the final.
Fellow Briton Ranah Stoiber is also in action in the junior girls' singles semi-finals.
Djokovic 'couldn't ask for a better situation'
A lot can happen in 12 months. One year ago, Serbia's Djokovic was absent from the Australian Open having been deported from the country because of his Covid-19 vaccine status.

Move the clock forward to the present day and he is playing some of his finest tennis, a hamstring injury no longer hampering him the way it did in the early rounds of the tournament.
"I always try to give my best, particularly in Grand Slams, because at this stage of my career those are the tournaments that count the most," said the 35-year-old.
"But you could say that there is something extra this year, yeah. You could say because the injury, what happened last year. I just wanted to really do well.
"So far I have a perfect score in Australian hard courts, in Adelaide and here. I've been playing better and better. I couldn't ask for a better situation to be in at the moment."
Latest Stories
-
Robust anti-laundering fight critical for regional stability – Veep
2 hours -
Car ploughs into crowd outside LA nightclub, injuring 30
3 hours -
GNAT President calls for parliamentary legislation to protect reinstated PTAs
5 hours -
NPP Abanga blames his NDC twin brother for his misfortune
6 hours -
NPP Abanga breaks ranks to shield NDC twin brother in ‘galamsey’ accusations
6 hours -
Saminu Abdul Rasheed smashes national record again with 9.84s sprint in Georgia
7 hours -
Blekusu Coastal project: We’re reclaiming our coastlines – Housing Minister
10 hours -
Pricey plantains push Ghana’s market sellers to diversify
10 hours -
Full list: NPP delegates approve 54 reform motions, reject proposals on youth age, election supervision
10 hours -
WAFCON 2024: Cynthia made it easy – Chantelle hails goalkeeper after penalty saves
10 hours -
Cyber Security Authority boss suspended over use of military bodyguard
11 hours -
WAFCON 2024: I want to make history – Grace Asantewaa dreams of lifting the trophy
11 hours -
Afenyo-Markin accuses NDC of rebranding and claiming credit for NPP projects
11 hours -
2024 WAFCON: Grace Asantewa shines as Black Queens reach semis
11 hours -
WAFCON 2024: Ghana beat Algeria 4-2 on penalties to book semi-final spot for the first time since 2016
11 hours