Karlsson's one-under 70 was also an eventful affair as it included five birdies and four bogeys.
In a highly unusual arrangement, Karlsson will oversee creative in two offices, New York and London, simultaneously.
Liquor brand Karlsson's hopes to change that with the U.S. debut this week of its first vintage vodka.
Mr. Karlsson produced a vodka made from 2004 Solist potatoes, then made a batch from a 2006 harvest.
But Micheel got closer with his escape and when Karlsson missed his 15-footer, the Swede conceded the match.
Colin Greening also scored for Ottawa, which is playing without star defenseman Erik Karlsson and forward Jason Spezza.
The Englishman's marker moved and he was penalised as Karlsson holed a four-foot birdie to secure his victory.
Karlsson, chasing his second title in a week, found the trees twice as he ran up a double-bogey six.
Overnight leader Poulter and Karlsson had both finished the tournament on 14-under-par after respective rounds of 70 and 67.
Ottawa is without C Jason Spezza (upper-body injury, day-to-day), C Mike Hoffman (collarbone, indefinitely) and D Erik Karlsson (Achilles, indefinite).
Rounds of 61, 63 and 65 on the first three days saw Karlsson beat the 36-hole and 54-hole Tour records.
Swedes Robert Karlsson and Johan Edfors, plaus Frenchman Julien Guerrier, winner of the British Amateur championship, will also make their debut.
Karlsson opened the scoring at 8:17, just 27 seconds into the game's first power play when his point shot eluded Enroth.
Robert Karlsson and Paul Broadhurst, who finished first and second in the Wales Open at the weekend, could not maintain their form.
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As well as Harrington, Howell and Karlsson desperate to overhaul him, there are a host of big names hot on his heels.
With the US three points ahead, Europe needed to get going and they briefly rallied with Karlsson and then Rose claiming victories.
Micheel moved two ahead with a birdie at 20 but Karlsson got back to all square with a scrappy bogey at 27.
Robert Karlsson won the event after a dramatic play-off with Ian Poulter.
Micheel's approach at 36 ricocheted off the grandstand into a greenside bunker, but Karlsson was unable to take advantage and followed him in.
Poulter was docked a shot on the second extra hole after he dropped his ball on his marker, leaving Karlsson to win it.
"I think when you're one man short you can even create some momentum there, " said Karlsson following his sixth goal of the season.
Karlsson had rounds of 73 and 74 to miss out on the play-off by seven shots while Broadhurst was only one stroke better off.
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Robert Karlsson, Harris English and Ted Potter Jr. shot 64, and two-time major champion Angel Cabrera, Ryan Palmer and Camilo Villegas were at 65.
Karlsson was four shots clear after seven holes after recovering from a bogey at the first with three birdies in his next four holes.
Karlsson, last season's Norris Trophy winner as the league's top defenseman, says he always looks to go on the attack while killing a penalty.
Erik Karlsson, Chris Phillips and Daniel Alfredsson scored for Ottawa, and Peter Regin picked up his first points of the season with two assists.
The Senators were also without G Craig Anderson (ankle), defensemen Erik Karlsson (Achilles) and Mike Lundin (concussion), and forwards Jason Spezza (back) and Dave Dziurzynski (concussion).
He ended up playing four matches but only managed a half with Robert Karlsson in the day one foursomes contest against Phil Mickelson and Anthony Kim.
Ryder Cup player Robert Karlsson, the world number 21, who is the highest-ranked player in the field, finished in a share of 69th after a 72.
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