Jack Sock of USA. Photo / Getty Images.
Herald tennis reporters provide the latest updates from finals day at the ASB Classic men's event.
1.35pm
Michael Venus and Mate Pavic have won the ASB Classic doubles 7-5 6-4 over American duo Eric Butorac and Scott Lipsky.
It was a superb performance against the two American veterans, who had 31 career titles between them.
It's the first time a New Zealander has truimphed on finals day in Auckland since Marcus Daniell was part of the victorious doubles team in 2010.
Venus and Pavic were strong on serve, secure from the baseline and quick on the volley. In contrast Lipsky in particular struggled all day with his return of serve, which eventually became an insurmountable weakness.
After securing a break early in the second set, the Kiwi-Croat combination noticeably lifted and held on to their break with relative ease to take their second ATP title together.
1.00pm
New Zealander Michael Venus and Croatian partner Mate Pavic have one hand on the ASB Classic doubles trophy, after taking the first set 6-4 against American duo Eric Butorac and Scott Lipsky.
Games went with serve until the ninth game, when some moments of brilliance from Pavic gave the Kiwi-Croatian combination four break points, and they were good enough to convert their first.
The Croatian then showed impressive composure to serve out the set in the next game.
9:30pm
Jo-Wilfried Tsonga has crashed out of the ASB Classic, beaten 6-3 6-7 (4) 4-6 by Spanish third seed Roberto Bautista Agut
The second seed - and crowd favourite - started the match on song, with his trademark flash and dash, but lost his accuracy as the match wore on.
He 30-year-old struggled all night off his backhand wing and made a ton of unforced errors.
But as much as Tsonga was slightly off his game, World No25 Bautista Agut continued his hot run at this tournament.
After upsetting the world No 11 John Isner yesterday, he scored his first win (in three attempts) over Tsonga to reach his seventh final.
9.00pm
The second semi final at the ASB Classic between Jo-Wilfried Tsonga and Roberto Bautista Agut has turned into a thriller.
Tsonga took the first set 6-3, before the eighth seeded Spaniard came back to win the second set in a tiebreak 7-6 (4).
It was a remarkable effort from the world No 25, who fended off a match point in the second set.
The third set is currently locked at 4-4.
7.03pm:
David Ferrer is out of the ASB Classic, beaten 6-3 1-6 2-6 by American Jack Sock in Friday's first semi-final.
It means the Spaniard will have to postpone his tilt at history for another year, as he aims to become the first player to win Auckland's ATP event five times.
It was an incredible match and a victory to savour for the American - his first win over a top 10 player for almost 18 months, stopping a nine match losing streak against the game's elite.
The Spaniard made a solid start before falling apart as the 23-year-old came roaring back, almost impeccable in the final two sets.
"I knew I had to play some unbelievable tennis today and that's what I did," said Sock.
Sock, who revealed after the match that he woke up on Friday morning with "flu like symptoms", started out of sorts, as Ferrer dominated from the outset.
The world No8 grabbed a break in the sixth game of the first set and never looked like giving up his advantage, taking the set when Sock flailed a wild forehand out of court.
During the break between sets, Sock called for the ATP doctor as they discussed his condition.
He then changed his shirt, and changed the match. The world No 25 streaked to 4-0 lead and would go on to win 12 of the next 15 games.
The Nebraska native had all the the momentum, but still showed a nice touch of sportsmanship when he called a Ferrer serve in to give him a game early in the third set.
Ferrer continued to hustle but his timing was off; he struggled with the pace of the American's ground strokes and couldn't draw him into rallies.
Sock lost only two points when his first serve landed in the second set, and only four points in total in the final set.
Ferrer's predicament was epitomised when he badly framed a forehand volley to give Sock match point, which he converted with a second set ace.
6.34pm:
American youngster Jack Sock has pulled off a stunning upset win over top seed David Ferrer to book his place in just his second ATP Tour final.
After dominating the second set, the momentum stayed with Sock in the third. He broke Ferrer in the opening game and never looked back, taking out the set 6-2.
The winning point came off a second serve ace.
The result ended Ferrer's campaign for a record fifth title at the Auckland event.
Sock will meet the winner of the second semifinal between Jo-Wilfried Tsonga and Spaniard Roberto Bautista Agut, which is next up on centre court.
6.10pm:
The first semifinal is headed for a third set.
David Ferrer, the tournament top seed, looked to be comfortably cruising to a fifth finals appearance in Auckland after taking out the first set 6-3.
Sock looked lethargic and out of sorts in the opening set and sought treatment from the doctor during the break. The extra rest period did wonders for the 23 year-old, who won the first four games after the break on his way to a 6-1 win.
5.28pm:
It's semifinals time at the ASB Classic with four-time champion David Ferrer about to take the court against rising US tennis star Jack Sock.
Sock, the world No. 26, knocked over the 12th ranked Kevin Anderson yesterday to earn his place in the semifinal. He is chasing just his second final appearance on the ATP tour.
Later this evening second seed Jo-Wilfried Tsonga will meet Spaniard Roberto Bautista Agut in the second semifinal.
In the doubles, the first finalists have already been found, with the US pairing of Eric Butorac and Scott Lipsky making quick work of Austria's Julian Knowle and Oliver Marach.
The Americans will face the winner of tonight's semifinal, which is certain to test the loyalty of the crowd. New Zealand's Marcus Daniell and Artem Sitak will take on fellow Kiwi Michael Venus and his Croatian partner Mate Pavic.
The good news is there is guaranteed to be some New Zealand representation in tomorrow's doubles final.
Even at age 38, the world No 55 is a huge drawcard for the Auckland tournament.