2013 Masters: Tiger Woods favourite for Augusta but who else is shaping up for a challenge?

With exactly four weeks to go until the 2013 Masters begins, just how are the top challengers getting on in the build-up to the opening major of the golf season?

Graeme McDowell Could it be G-Mac getting fitted for the green jacket? Well, the former US Open winner certainly seems to be cranking up his form at the right time and did well enough going toe-to-toe with Tiger at Doral to suggest he is in the groove. He had a decent record in all the majors last year finishing 12th, 2nd, 5th and 11th - which is form not to be sniffed at by any means and runs of T5, T9 and T3 finishing with Doral puts McDowell right in the sort of form you need for a major. Justin Rose Could the Englishman be Europe's big challenger at Augusta? If McIlroy is still struggling with his game then he could well be, with Rose continually improving his game and standing in world golf. Rose has not won in 2013, but has been a solid top-ten man, is up to No 5 in the world rankings and is becoming more and more respected in America - couple that with finishes of fifth and eighth at Augusta and he could be your man. Brandt Snedeker A win at Pebble Beach and three other top-three finishes in five events is not a bad way to start the season for the reigning Fed-Ex Cup champion, and his putting and temperament would suggest a green jacket is not out of reach. A tied third in the 2008 Masters also means Augusta is to his liking, and with his ability to hit greens consistently he'll be in and around the leading fancies come April. Adam Scott The Aussie has the look of a man due a major win, after coming so close at the Open last year before handing the Claret Jug to Ernie Els in the closing stages. Finished second and eighth in the last two Masters, and a third place at the Cadillac showed that he has maintained his form going into 2013 - plus he has the famous Steve Williams on the bag! Matt Kuchar The winner of the first WGC title of the year might have done it in a matchplay situation, but the world number nine will take huge confidence from that as he looks to bag a maiden major title. His strokeplay form is not what you would like so far in 2013, but with a tied third in last year's Masters Kuchar knows how to go low at Augusta. Luke Donald Not much has been spoken about Donald, but the Englishman is still the world number three and must be respected as a big challenger for the Masters. Donald took a long holiday over the winter and although he's made a slow start to 2013 he's got three top tens at Augusta and was tied forth two years ago, and you get the impression his entire year will be geared around the majors. Watch the Masters live and exclusively on Sky Sports with all four days of action in HD & 3D with Red Button options of Amen Corner & 15th & 16th starting at 7pm on April 11.