Centre Darren Cave gave the final pass to midfield partner Paddy Wallace, who dived over after 32 minutes for Matt Williams' side to lead 13-3 at the break.
However, Ulster's domination was eventually rewarded by O'Connor's 16th-minute penalty as Matt Williams' young side continued to impress.
Former Sussex player Smith then helped add a further 17 before he was athletically taken down the leg side by Matt Prior off James Anyon.
The Super 14 side are in Newcastle for Matt Burke's testimonial and Bates is keen to see how his side will cope with the new rules in competitive matches.
After a tense, goalless opening period, Matt Foord put the home side ahead from close range.
From the resulting Manly penalty, the visitors pushed for the line and Stewart showed some quick thinking to scramble over from dummy-half and put his side ahead with Matt Orford adding the extras.
Leinster coach Matt Williams said afterwards that his side had recovered after a "nervous start".
I've got a huge amount of respect for people like Martin Johnson, Lawrence Dallaglio, Neil Back and Matt Dawson who have captained the side and done it so well.
Blues boss Alex McLeish threw on strikers Nikola Zigic and Matt Derbyshire in a bid for his side to get an equaliser.
Away form is a concern for coach Matt Williams as he has seen his side win just once on the road this season.
Kevin Kyle, substituted on Sunday, squandered a host of chances, heading Matt Piper's cross, then side-footing wide after being set up by Stewart.
BBC: SPORT | Football | English Div 1 | Wimbledon 1-2 Sunderland
Montgomery added the conversion points and four minutes later Steyn landed a penalty from the other side of the field after Matt Stevens was pulled up for not rolling away on the floor.
Matt Tubbs put the Blue Square Bet Premier side ahead with a neat finish.
Boosted by the goal, Newry bossed the contest for the remainder of the first half as Ross Black and Matt Hazley both went close for the home side.
England convincingly won the first Test, although they had been reduced to 98-6 in the second innings before Matt Prior's century helped the home side establish a comfortable lead which Pakistan failed to chase down.
But a late Matt Smith's header earned the League One side a replay.
But Matt Hernandez, a station attendant on the Manhattan side, said he has to remind people every day and deal with resisting adults.
Former Bath prop Matt Stevens was a standout player for the home side, putting in a man-of-the-match display for his new club as they stifled Bath's attacking intentions.
Wolves had also got off to a lightning start against Saints in last season's play-offs when Matt King ran in two tries to put his side 8-0 up in the first six minutes.
James Anderson, resuming new ball duties after his 20, 000-mile round trip to England for the birth of his second child, thought he had dismissed Shane Watson in the first over of the match when Matt Prior took a flying catch down the leg side.
The introduction of substitute Vainikolo gave the home side more attacking flair and Leicester's Matt Smith was sinbinned for killing possession.
But the home side soon got their passing game going, Matt Holland's long-range effort well saved by Mart Poom after Warren Barton only half-cleared.
From Matt Prior at six down no-one in the side averages above 25 while Paul Collingwood, so long a stalwart, comes in at five with an average of 19 from his last 10 ODI innings.
The home side led 13-9 at the break after Matt Banahan's second-minute try.
Three of the Dover side that day, striker Adam Birchall, defender Matt Fish and goalkeeper Ross Flitney, all joined Gillingham in the summer.
Matt Sandusky, now 33, did not testify for either side, but Jerry Sandusky insists that his adopted son's desertion and potentially damaging testimony kept him from testifying in his own defense.
Matt Jansen's incisive finish after a sweeping move gave the home side an early lead, but having started so well Blackburn imploded defensively.
BBC: SPORT | Football | Premiership | Blackburn 3-3 Birmingham
Mark Pettini was also undone by Batty and Jordan and when Matt Walker became Tim Linley's maiden Championship wicket, the home side were in trouble.
Tuncay Sanli set the home side on their way when he slotted in after Hull keeper Matt Duke palmed a shot from Afonso Alves into his path.
Is there anything wrong with Matt Elam choosing to enter the NFL Draft without a contract advisor by his side?
FORBES: Safety Matt Elam Is Only Top Prospect To Enter NFL Draft Without An Agent
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