A 66-year wait ends at Celtic Park on Saturday lunchtime—or it doesn't. Hearts, the Scottish Premiership leaders since September, arrive in Glasgow needing only to avoid defeat to claim their first title since 1960. Celtic, hunting a fifth consecutive crown, must win. The stakes could hardly be higher, and the atmosphere promises to be electric.

This is not a routine final day. It is Scotland's first title decider between the top two teams since Rangers edged Aberdeen in 1991, and it represents a rare breach of the Old Firm's dominance. No team outside Celtic and Rangers has finished atop the Scottish Premiership since Aberdeen in 1985—nearly four decades of duopoly. If Hearts succeed, they break that pattern. If they fail, another year of waiting begins.

Hearts carry genuine form and psychology into this contest. They are unbeaten against Celtic in three meetings this season, twice winning outright—a stunning 3-1 victory at home in October that ended Brendan Rodgers' second spell, followed by a 2-1 away triumph when Wilfried Nancy made his debut as Celtic boss. In January, they drew 2-2 at Gorgie after twice coming from behind. That record matters. Hearts also lead by a single point after 37 games, and their recent form in the split—three wins and a draw across four matches—shows they have recovered from an earlier wobble when they managed just one point from four away games before the division broke.

Yet Celtic possess something Hearts lack: momentum and the experience of a manager who has engineered comebacks before. Martin O'Neill, 74, has emerged from retirement twice this season. When he first arrived, Hearts held a six-point lead with 20 matches played. O'Neill said he would need seven wins to have a chance. He has delivered six. Now, one final victory completes the mission. Celtic have won six consecutive league matches and are chasing a 14th title in 15 years and their 55th championship overall.

The contrast between the managers is stark. O'Neill collected seven trophies during his first Celtic stint from 2000–05, including three league titles, before stepping into the breach again and again this season. Derek McInnes, Hearts' boss, finished ninth with Kilmarnock last season and was a runner-up to Celtic three times during his Aberdeen years. Yet McInnes has something O'Neill does not: Sir Alex Ferguson in his corner. The legendary manager, last to break the Old Firm duopoly, has been spotted in maroon at Tynecastle and remains in regular contact with McInnes.

The weight of history pressed on both sides long before Saturday arrived. Hearts came agonizingly close in 1965 and 1986—the latter particularly cruel when they were seven minutes from glory before Dundee substitute Albert Kidd struck twice at Dens Park. Celtic have their own recent near-misses, missing out on titles in the final fixture in 2003, 2005, 2009, and 2011. Now, 33 years after that brutality against Dundee, Hearts have a chance to reclaim what has eluded them for two-thirds of a century. One match. One afternoon. One outcome that will reshape Scottish football.