LONDON (REUTERS) - DEMBA Ba made an instant impact with two goals on his Chelsea debut as the holders romped to an emphatic 5-1 victory at Southampton in the FA Cup third round on Saturday.
Newcastle United, the club Ba left on Friday, continued their dismal run of form with a 2-0 defeat at Championship (second tier) side Brighton and Hove Albion - a rare upset on one of the most eagerly-awaited days in the English season.
Goals from Andrea Orlandi and Will Hoskins earned Brighton a repeat of their fourth round victory over Premier League Newcastle last season, condemning Alan Pardew's side to an 11th defeat in 14 matches.
Major shocks were non-existent although Cardiff City, currently romping away at the top of the Championship, were beaten 2-1 at minor league Macclesfield Town - who reached the fourth round for the first time.
Minor league Luton Town also beat second tier Wolverhampton Wanderers 1-0.
Several clubs struggling in the Premier League flirted with defeats against lower league opposition but survived.
Fulham drew 1-1 at home to Blackpool, third tier Bournemouth earned a replay with Wigan Athletic after holding them to a 1-1 draw while Sunderland drew 2-2 at Bolton Wanderers who were relegated from the top flight last season.
Reading had to come from a goal down to beat third tier Crawley Town 3-1 away.
South coast seventh-tier minnows Hastings United, the lowliest survivors of the 758 clubs which began the 132nd edition of the knockout competition in August, had their fairytale cut short in a 4-1 defeat at Middlesbrough.
Premier League champions Manchester City, winners of the competition in 2011, eased into the fourth round with a 3-0 defeat of Gianfranco Zola's Championship side Watford.
Tottenham Hotspur's fine run of form continued with Clint Dempsey scoring twice in a 3-0 home victory over third tier Coventry City, the side they lost to in the 1987 FA cup final.
Finally, West Ham and Man Utd are headed for a replay after a 2-2 draw at Upton Park. Robin van Persie scored the Red Devils' equaliser in injury time to send the tie back to Old Trafford.