De Gea improvement 'key to United challenge', says Martyn

Former England goalkeeper Nigel Martyn believes David de Gea’s upturn in form has been the catalyst behind Manchester United’s resurgence as odds-on favourites to retain their Barclays Premier League title.

Martyn, who made 23 appearances for England between 1992 and 2002, thinks the 21-year-old goalkeeper has rediscovered his confidence following a tough start to his career at Old Trafford.