Paul Buckle's in-form Torquay overtook Macclesfield thanks to skipper Nicky Wroe's 86th minute stike in a 1-0 win.
Midfielder Wroe's 13th goal of the season maintained United's six match unbeaten April record, which has included five wins.
In stoppage time Scott Rendell smashed a low shot off the post.
United had the better chances and forced the pace, signalled by target man Rendell forcing a save off visiting keeper Jon Brain after two minutes.
Top scorer Elliot Benyon was next to test the visiting number one, forcing Brain to make a full length save in the third minute.
It was to set the tone for the remainder of the half, with the Macclesfield keeper far busier than his counterpart Michael Poke.
Brain made an instinctive save to deny Benyon as the in form Gulls striker let fly with a thumping 23rd-minute volley.
Three minutes later, Brain saved well from Rendell after a brilliant, length of the field move instigated by central defender Mark Ellis' powerful headed clearance down the right channel and carried on by winger Mustapha Carayol, who swept forward down the right flank.
At the bye line, the winger thumped in a low near-post cross, Benyon helped the ball on and when the ball fell to Rendell he first timed it towards goal, where the keeper made another superb stop.
Carayol then disposed Macclesfield midfielder Matthew Lowe before racing away towards goal from inside his own half. Carayol unselfishly passed across the 18-yard box to unmarked Benyon, whose low shot looked goal-bound until Brain stuck out a leg and again denied the United forward.
Brain continued to thwart United in the second half, denying Rendell in the 48th minute with another superb stop after defender Paul Morgan failed to clear Chris Zebroski's dangerous cross.
Chris Zeboski beat Brain in the 68th minute but his header bounced inches wide, with the keeper committed.
Town's best effort was a 30-yard dipping shot on the run by winger Vinny Mukendi.
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