Wes Morgan sent Leicester seven points clear at the top of the Premier League as the Foxes beat Southampton to take a massive step to the title.
The captain's first goal in 11 months handed them a 1-0 win — their fourth in a row — as Claudio Ranieri's side sent out a further warning to their rivals.
The Foxes' Great Escape, where they won seven of their final nine games to beat the drop last season, started a year ago this weekend with a 2-1 win against West Ham - and they again stand on the brink of something extraordinary.
With just six games left they lead Tottenham, who drew 1-1 at Liverpool on Saturday, and stayed on course for a remarkable title victory with a routine win.
Sadio Mane wasted Southampton's best chance in the first half when his shot hit Danny Simpson after he rounded Kasper Schmeichel while Fraser Forster brilliantly saved from Simpson in the second half. Defeat also dented the Saints' hopes of reaching Europe and they were on the back foot from the first whistle.
Jamie Vardy, fresh from his two England goals, buzzed around to irritate the visitors and forced Forster into a sliced clearance.
