Brent McMahon is racing IRONMAN Arizona this weekend. Hello .. Brent McMahon is heading back to Tempe, AZ to reclaim the crown he won 2 years ago. You may recall, that in 2014, in his first IRONMAN, Brent recorded the world’s fastest IRONMAN debut at 7:55:48 winning his first IRONMAN. That would be his first sub 8-hour IRONMAN finishes and …