Following 6-2 from the morning, Maguire started the evening brilliantly with breaks of 62 and 73 to return to 6-4.
In any case, the world number one answered in style with runs of 64, 55, 69, 94 and 73 to reassert his power before the Scot took the evening's last edge.
It leaves O'Sullivan two casings from a thirteenth Crucible semi-last.
In the evening's other last-eight match China's Yan Bingtao retaliated wonderfully from 6-2 down against Mark Williams to go into Wednesday's concluding meeting level at 8-8.
The 2021 Masters champion designed a five-ball plant en route to winning the evening's initial casing and thumped in breaks of 80, 72 and 103 to take four of the initial five as the already familiar Welshman battled to observe his musicality after a few extended wellbeing trades.
Yan likewise won an extended fourteenth casing enduring 50 minutes, which saw a re-rack and an unscheduled stoppage to permit Williams a latrine break, to draw level.
Furthermore, he took a crude fifteenth before Williams won a brazen last edge to leave the match gently ready.
O'Sullivan storms ahead
Having been outflanked during the early meeting on Tuesday, Scotland's Maguire confronted the unenviable place of attempting to diminish a four-outline shortage against a player he last crushed in 2012 at the China Open.
Furthermore, on occasion the previous UK Champion didn't help himself. Some deviant positional play and free preparing gave O'Sullivan a lot of chances to pull clear, with Maguire's burdens underlined by an inadequately laid snooker endeavor in the eleventh casing and running out of position when very much positioned in the thirteenth edge.
By then O'Sullivan, who is pursuing a record-equalling seventh Crucible crown in the advanced time, had warmed to his assignment in spite of over and again seeming disappointed by his sign tip.
His 94 to win the fourteenth edge was a magnificent show of prompt ball control and awesome preparing and, notwithstanding an uncommon circle back, he will hope to progress to the last four when play resumes on Wednesday morning (10:00 BST).
Class of '92 are over and above anyone's expectations - Higgins
Higgins and Trump possibly figure out leads
Prior, four-time title holder John Higgins hopefully managed with a 5-3 lead against Jack Lisowski in a blunder thronw opening to their quarter-last.
Lisowski opened with a break of 98 and Higgins made 91 and 67 yet the two players by and large battled for beat and were at fault for a few strange misses.
In the mean time, Judd Trump drives Stuart Bingham 5-3 with both of the previous champs in fine touch as they assembled two half-hundreds of years and a long period in a great issue.
Trump, who came out on top for the championship in 2019, looked set to pull clear when he made breaks of 50 and 75 to lead 4-2 yet 2015 victor Bingham showed his determination with a great 106.
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