Faldo
Jack Nicklaus was the first to defend his Masters title. He won in 1965 and defended in 1966. Since then, two other players have defended their win at the Augusta National Golf Course: Nick Faldo - 1989/1990 and Tiger Woods - 2001/2002.
Moved on from my previous answer - Darren Clarke, which was correct at the time of writing - Updated again to Rory McllRoy in 2014.
If he is able to make a full golf recovery from his knee injury then yes.
92 professional wins including 68 on the PGA Tour and 14 majors.
Yes. Michael Woodard wins the majors and minors contest
Padraig Harrington won three major championships during his professional golf career. He won the British Open in 2007 and 2008, as well as the PGA Championship in 2008.
The record for the biggest 54-hole deficit overcome belongs to Jack Burke, who came back from 8 strokes down in 1956 to win the Masters. He actually fell to nine back before mounting his rally. And in 1978 Gary Player overcome a 8-stroke deficit to mount the second biggest final round comeback in Masters history. In 1996, Nick Faldo famously overcame a 6-stroke deficit to Greg Norman to win, the third biggest final round comeback in Masters history.
Fourteen majors
14
Cameron DeFaria
3