Wagering giant Tabcorp is confident the finishing line is finally in sight for its $11 billion merger with Tatts Group despite the potential of a last-ditch legal bid by rival CrownBet or the corporate regulator to scupper the deal at the 11th hour.

The Australian Competition Tribunal ruled the merger could proceed on Friday and while online bookmaker CrownBet would not rule out making one last move to try to scupper the deal, Australian Competition and Consumer Commission chairman Rod Sims said the watchdog was comfortable with the outcome, pending the release of the judge's reasons next week.