Mosman passed up a chance to secure the Premier League title after drawing 0-0 with Brookvale on Sunday.
Remarkably, the result still saw them extend their lead on top of the ladder to three points as their nearest contender Manly Vale also slipped up.
While they entered the contest as short-priced favourites, the undefeated Wales struggled to break down a determined Brookvale outfit.
However their coach James Spyrakis could not fault the effort of his side.
“It was just sloppy from the very start,” he said.
“I don’t think any of the two teams had real control of the ball – it was a lot of end to end stuff just from centre back to centre back.
“Maybe the wind played a bit of a part and obviously the heavy rain from the morning made the pitch real sloppy so for us as well.
“Both teams gave 100% the whole time, that’s probably why today was a draw – I think just neither team could find control.”
Manly Vale’s 2-1 defeat to Seaforth meant that the race for top spot will go right down to the wire next weekend.
Over at Melwood, Manly Allambie enjoyed a tight 1-0 win over Wakehurst.
Pittwater’s clash with Beacon Hill was unfortunately washed out.