( CNN ) -- Two-time English FA Cup holders Chelsea needed a late goal from substitute Salomon Kalou to stay in the competition Saturday as the Ivorian 's 75th-minute goal rescued a 1-1 draw at Everton in their fourth round clash . France striker Louis Saha gave Everton the lead in the second half of the contest -- which was a repeat of the 2009 final -- with a close-range header from Leighton Baines ' corner . Chelsea manager Carlo Ancelotti reacted by replacing winger Florent Malouda with Kalou after 70 minutes and his decision paid dividends . The 25-year-old Kalou finished off a swift counter-attack when he drilled a low shot past Everton goalkeeper Tim Howard from just inside the penalty area to earn a replay for the visitors . `` We had a good attitude and spirit and were able to score and take a draw , '' former AC Milan boss Ancelotti told the club 's official website . `` It was not an easy game because Everton put strong pressure all the time on the pitch , used a lot of long balls , they were very dangerous on set-pieces and scored on one . It was a difficult game . '' Premier League leaders Manchester United survived a scare at third division Southampton before they scored a 2-1 win . Alex Ferguson 's team fell behind to Richard Chaplow 's firmly hit strike moments before half time as the Saints took a well-deserved lead . But United responded after the break when Michael Owen headed Gabriel Obertan 's drilled cross into the net to restore parity . The comeback was complete with 76 minutes gone after Javier Hernandez latched on to substitute Ryan Giggs ' through ball and calmly converted the chance with a side-footed finish . It was the Mexican 's ninth goal of the season and it ensured the Red Devils reached the last 16 of this competition for the eighth time in nine years . Veteran French midfielder Robert Pires scored his first goal for Aston Villa as Gerard Houllier 's side earned a 3-1 victory over Blackburn Rovers to reach the fifth round . Pires , 37 , found the net with a neat half-volley to restore Villa 's lead after Croatia striker Nikola Kalinic had canceled out Ciaran Clark 's opener . England under-21 striker Nathan Delfouneso wrapped up the game for the home team with a header just before half time . Non-league outfit Crawley Town caused one of the day 's biggest shocks as they earned a 1-0 success away to fourth division Torquay United . Matthew Tubbs ' goal after 39 minutes was enough to secure a place in the last 16 for the final non-league club left in the competition . In an all-Premier League tie , Bolton Wanderers and Wigan Athletic will have to play again after the two north-west rivals could only manage a 0-0 draw .
NEW : Manchester United come from behind to beat Southampton 2 - 1 . Salomon Kalou 's 75th minute goal rescues a 1 - 1 draw for Liverpool against Everton . Aston Villa are through to the fifth round after a 2 - 1 victory against Blackburn . Crawley Town upset Torquay United with a 1 - 0 win , Bolton and Wigan draw 0 - 0 .