Dan Walker is joined by Mark Lawrenson to preview the weekend's fixtures. It's FA Cup semi-final weekend, with Aston Villa taking on Chelsea at Wembley later today in a repeat of the 2000 final. The London club won that encounter 1-0 and are the current holders, while Villa last won the famous trophy back in 1957. In Sunday's semi-final, crisis club Portsmouth will be aiming to reach the final for the second time in three years and a repeat of their 2008 Cup glory. In the Premier League, the relegation battle intensifies as Hull host Burnley, while champions Manchester United's pursuit of an unprecedented fourth consecutive title takes them to North West rivals Blackburn on Sunday. We'll also have reaction to the midweek Champions League quarter-finals, which saw United and Arsenal both in action.