Mr Adams had been working in a bar on match day
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A 24-year-old man has been released on police bail after being arrested in connection with an attack which left a barman in a coma 18 months ago.
The man, from the Grangetown area of Cardiff, was questioned overnight by detectives investigating the assault and robbery of Leon Adams in February 2002.
Mr Adams, 25, was found unconscious at Grangetown railway station in the early hours of Valentine's Day, and remains at Morriston Hospital in Swansea following the attack.
Police have also appealed for an anonymous woman who contacted the BBC TV Crimewatch programme last year to get in touch.
BBC's Crimewatch has twice featured the incident and issued an appeal for public help, but the response has been disappointing.
The 24-year-old man was arrested on Wednesday afternoon and was questioned at Fairwater Police Station before being released on Thursday.
Mr Adams, from Ystradgynlais in the Swansea Valley, had been working in The Cottage pub in St Mary Street, Cardiff, on the day Wales played Argentina in football at the Millennium Stadium.
He was spotted on CCTV walking down St Mary Street just before 0200 GMT, and was found unconscious just after 0500 GMT.
A poster campaign was also launched when Wales played Bosnia a year later, in February 2003.
Anyone with information should call Fairwater Police Station on 02920 571530 or Crimestoppers on 0800 555111.