Hayden Mullins soon had a chance to double the lead after a poor clearance by goalkeeper Taylor, but Alex Bruce took the ball off his toes as he lined up the shot.
After 16 minutes, St Mirren took the lead when Dorman picked up on a headed ball from Wyness and ran into the box before coolly slotting under Esson.
Pennant, who has struggled to make an impact since his summer move from Birmingham City, took aim as the ball sat up perfectly and sent a stunning dipping volley beyond the outstretched arm of Cech.
His replacement Derick Hougaard just missed with a drop-goal attempt but it looked like Leicester had done enough to hold on for the win, until Bowe's breakaway took the ball right down to the Tigers' line to set up a tense finale.
The match started in glorious sunshine, however, the players' fingers took some time to warm up judging by the number of times the ball was dropped in the scrappy opening exchanges.
Although that opportunity went begging, the Dragons took a surprise lead soon after when Hugh Gustafson scooped up a loose ball and went haring through the midfield.
Even with 10 men, Tottenham still took the initiative and Defoe came desperately close when the ball landed at his feet after yet another mix-up in the Birmingham defence.
Hateley came reasonably close with two free-kicks and his interception and through-ball set up Sutton, but the striker took too long to shoot.
Warriors skipper Trent Barrett was held up with the ball as he crashed over before Hansen took Leuluai's pass to stroll through a gap in the Bradford defence from close range.
The three-time major winner took a drop under penalty but thought it was an illegal drop, so picked up the ball and dropped again in a different spot.
The next time up, Cano took a wild swing and missed a 72 mph breaking ball by a lot.
Saints took instant advantage as Sheridan lashed the ball home from close range following gritty build-up play from Deuchar.
Murphy took further advantage of the extra man four minutes later by crossing the Ospreys line after O'Leary picked up a loose ball and passed for the winger to race over in the corner.
After soaking up some Sarries pressure, Sexton and O'Driscoll exposed the Sarries defence near halfway, Strauss then took the ball on and McFadden had a comfortable 30-metre run to the line, with Sexton adding the extras.
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