Lou Vincent arrives at court to front in the case against Chris Cairns.

After hour upon hour of being called a liar and having his motives and credibility attacked, Lou Vincent left Southwark Crown Court weary and red-eyed.

A key witness in the perjury trial of former Black Caps skipper Chris Cairns, the former cricketer spent almost five hours being cross-examined.

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KEVIN NORQUAY/FAIRFAX NZ Chris Cairns arrives at Southwark Crown Court to hear day two of evidence against him.

Vincent started Tuesday (Wednesday NZ time) more confidently than the day before, at times firing back at Orlando Pownall, QC.

But under constant questioning and suggestions from Cairns' lawyer that he was lying, he gradually wilted.

By late afternoon he was struggling to comprehend or answer questions.

Stephen Barker/ Fairfax NZ Former Black Caps fast bowler Daryl Tuffey.

For the second successive day, court was adjourned to allow him to recover.

Mr Justice Sweeney halted proceedings for the day an hour early after Vincent said he was "extremely fatigued".

"That's enough for you today," he told Vincent, who indicated he was prepared to carry on.

Vincent left the witness box with tears welling in his eyes.

Cairns, 45, is accused of lying under oath when he said in court he'd "never" cheated at cricket.

Perjury is a criminal charge carrying a maximum of seven years' jail. Cairns has denied all charges.

Vincent has told the London court that Cairns was the person who initially got him into fixing, in the unsanctioned Indian Cricket League (ICL) in 2008.

But Pownall said it was Vincent who was lying. Vincent is banned from cricket for life, after admitting match-fixing.

"Your lies have been not only extensive but in some cases quite clever when you've side-stepped the question."

He accused Vincent of making up his story as he went along, when the witness recalled details he had never disclosed to International Cricket Council (ICC) investigators or the Metropolitan Police.

One was Cairns told him to drop catches in fixed matches, the other that when fixing was discussed in a hotel room he would turn up the TV so potential eavesdroppers could not hear.

Vincent also got upset when the subject of his sleeping with a prostitute sent him as a "present" was raised again. He had omitted that detail from his ICC statement and his evidence on Monday, until pressed.

He did that to protect his then wife Elly Riley, he said, getting upset, as he had on day one.

The marriage, which produced two children, failed. Vincent has remarried.

"Can I help you?" Pownall asked to fill the silence.

"No you can't," Vincent fired back, asking Mr Justice Sweeney to step in.

"I would like to think I wouldn't be asked more about that your lordship," Vincent said.

Vincent told the jury that two years after helping fix matches for Cairns, Kiwi fast bowler Daryl Tuffey was furious he still hadn't been paid.

Tuffey and Vincent played under the captaincy of Cairns at the Chandigarh Lions in 2008, in the ICL.

Cairns offered Vincent US$50,000 (NZ$75,000) per match to under-perform by batting slowly, the former Black Cap opener said in his evidence.

He has yet to see the money. In 2010 in New Zealand, he asked Tuffey whether he had been paid.

"He said that he hadn't received a cent, and he'd f**king kill him," Vincent said.

Tuffey is not listed as a witness and has not had charges laid against him.

Nor was Vincent paid by Cairns, who Vincent alleged had promised him in excess of US$250,000 (NZ$375,000), within an unspecified time frame.

Asked why he carried on month after month "betraying your sport for nothing", Vincent was blunt.

"I was used by Cairns. He used and abused me, spat me out and went running and hiding."

Asked whether he'd talked to Tuffey about non-payment in 2008 he said there was no need.

"I believed Chris would look after us."

Cairns, Vincent, Tuffey and three Indian players were part of a match-fixing "gang" at Chandigarh, he had said.

Tuffey gave a statement that supported Cairns in his 2012 libel case against Lalit Modi.

Under cross-examination, Vincent asked Pownall whether Tuffey would appear in this trial as a witness.

"Where is [Tuffey] today? Is he going to help defend Chris this time around?"

Pownall started the day asking why Vincent had not reported Cairns if he had been asked by him to help fix matches, when it was his professional obligation to do so underICC rules.

The ICL was not sanctioned by the ICC.

"I wasn't going to report Chris Cairns, he was my captain, my coach, my mentor," Vincent told the jury.

Why had Vincent not taped Cairns talking about match-fixing, as he had his legal adviser Andrew Fitch-Holland, and Indian bookies, Pownall asked.

"Chris Cairns was very shrewd and wouldn't talk about match-fixing on the phone," Vincent replied.

The real reason Vincent had not taped Cairns talking about match-fixing was "it would have revealed not that he was involved, but that you were," Pownall said.

He was asked questions about bookies, meetings, gambling accounts, batting, and scores.

He asked if Vincent was working as a match-fixing double agent for side deals, with Vincent responding he had been paid by bookies for information about fixes.

Pownall also inquired into the witness's drug use and his betting.

"I had the odd occasional joint to calm my anxiety," Vincent responded.

The former Black Cap was asked why he had Paddy Power and a BetFair gambling accounts, and why in July 2011 and May 2013 they had been used to place bets on the method of dismissal in two cricket test matches.

Vincent said he was not interested in gambling, and could not recall using the accounts to bet.

"I can't recall something I'm not really interested in."

The phrase "I can't recall" was used so often in response to questions, it was possible Vincent raised a century of them.

Pownall asked whether the phrase meant Vincent was "hedging his bets" or "simply didn't want to commit".

Even on cricket they were at odds, when Pownall had footage shown of Vincent batting in a game where he hit consecutive boundaries and said he had outraged Cairns by ruining a fix.

In both shots, Vincent moved to the leg side, dangerously exposing his stumps.

Pownall suggested he had deliberately scored the runs with outstanding shots, rather than trying to get out.

"You bring the bat back and you deliberately smite it," Pownall said as the video played.

Vincent saw it otherwise.

"That footwork was completely horrendous. I completely disagree with your cricket opinion on that," he said to chuckles from the public gallery.

"Any professional cricketer watching would say he was lucky to hit the ball."

As for the four, Vincent said "that's a pretty lucky outcome" as it streaked to the boundary off an outside edge.

"I was trying to play loose again to try and get out."

When Pownall put it to him that the game had not been fixed by Cairns at all, Vincent retorted he should screen footage showing how poorly Cairns batted in that match.

Vincent's first day testimony focused on the dark underbelly of match-fixing, where results or scoring rates are rigged in advance so those in the know can cash in.

It also took in his personal woes, his battle with depression after being dropped from the Black Caps in 2007 and his use of cannabis and anti-depressants.