Glenn Loovens was dropped from Celtic's starting line-up, with Thomas Rogne and Mark Wilson stepping in.
Mahan started fast against his semifinal opponent Mark Wilson, winning the opening two holes.
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That came on 16 minutes and, after another 20, it was Sean Dillon's turn to deflect in a Mark Wilson shot.
Scott Brown and Mark Wilson were missing through suspension, while Daniel Majstorovic was injured and Anthony Stokes dropped to the bench.
Alongside him were fellow former world No. 1 Vijay Singh and fellow American Mark Wilson, who both moved up from 15th overnight with their 68s.
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Celtic already have Andreas Hinkel and Mark Wilson as cover at right-back, but Lennon has been suitably impressed by the player who has 50 international caps.
"I know this is difficult news for our employees, but these changes are essential if we are to remain competitive, " said Mark Wilson, group chief executive officer.
Andreas Hinkel and Mark Wilson are out of contract at the end of the season and manager Neil Lennon has moved to increase his options at full-back.
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From a free-kick, the Irishman picked out Mark Wilson rushing down the right wing and the full-back sent in a perfect low cross which Maloney touched narrowly wide.
And referee Collum restored parity of numbers as substitute McAllister saw red after only 35 seconds on the pitch, the midfielder penalised for scything down Celtic full-back Mark Wilson.
Glenn Loovens and Cha Du-Ri were dropped from Celtic's starting line-up, with Thomas Rogne and Mark Wilson stepping in, although Cha did start after Shaun Maloney was a late withdrawal.
Captain Scott Brown and defenders Thomas Rogne and Mark Wilson returned to the Celtic line-up, replacing Ki Sung-Yeung, Glenn Loovens and Efrain Juarez, all of whom featured on the substitutes' bench.
In the third minute Mark Wilson's cross from the right was missed by the Rangers defence and fell to Maloney, whose left-foot shot was saved by the legs of Allan McGregor.
Brown had returned to the Celtic midfield in place of Ki Sung-Yeung, while Charlie Mulgrew, Shaun Maloney and Cha Du-Ri came in for Mark Wilson, Georgios Samaras and the injured Emilio Izaguirre.
Stokes replied with a right-footed effort from the edge of the St Johnstone penalty area that Smith held well, then the Northern Ireland international missed with a close-range header from a Mark Wilson long-ball.
Wilson and the White Sox Mark Buehrle, a pair of borderline aces, the best available.
The Ireland A squad for the Barclays Churchill Cup in Canada and the USA in June also includes Ulster players David Pollock, Roger Wilson, Darren Cave, Mark McCrea plus recent Ravenhill recruit Ian Humphreys.
He had been convicted on June 7th of taking part in an attack on a train in southern Cambodia in 1994, and kidnapping and killing three young western backpackers: Jean-Michel Braquet from France, Mark Slater from Britain and David Wilson from Australia.
It was San Diego's longest game since the Padres lost to Arizona in 18 innings on June 7, 2009, when backup shortstop Josh Wilson served up a three-run homer to Mark Reynolds.
The first panel consisted of representatives of three regulatory agencies: John Ramsay of the U.S. Securities and Exchange Commission, Mark Van Der Weide of the Federal Reserve Board, and David Wilson of the Office of the Comptroller of the Currency.
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