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The skipper watched on as the Frenchman put on a brilliant display in the WGC-Accenture Match Play Championship at Dove Mountain.
Dubuisson threatened to pull off a remarkable victory, only to lose on the 23rd hole of an epic final with Australia's Jason Day.
"You can't help but be very impressed," said McGinley.
"A lot of us were all learning about Victor and the fortitude he has shown under pressure all week has been most impressive."
The 23-year-old, wearing his usual golf clothing, was three shots down with six holes to play but remarkably went on to win the 13th and 17th with birdies and then saved par on the 18th from a greenside bunker to force extra holes.
He produced some more miraculous escape shots, prompting praise from US Ryder Cup captain Tom Watson on Twitter, before eventually succumbing to Day on the fifth extra hole.
Dubuisson had the consolation of £545,000 for second place which, coupled with his earnings for winning his maiden European Tour title in the Turkish Airlines Open last season, means he is set for a Ryder Cup debut at Gleneagles in September.
© Copyright Press Association
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