Despite his team-mates doing their best to keep him busy by giving the ball away in their own half early on, he was a glorified spectator for long periods. Could do nothing about Lambert's excellent header or Puncheon's sensational half-volley.
Given plenty of license to roam forward, his crossing was invariably poor, although one of his more dangerous deliveries did lead to Ba's opener. Lost Lambert for Southampton's goal.
A couple of daft passes aside he was solid, and rarely troubled by a very isolated Rodriguez. Lambert posed a stiffer test, however.
Dealt comfortably with Rodriguez and was rarely beaten in the air or on the floor, although his passing might have been more incisive at times.
With Puncheon instructed to sit deep he spent most of the match as an auxiliary winger, and made a nuisance of himself without making the decisive breakthrough.
Looked alarmingly off the pace in the opening exchanges, but began to dictate things as the first half wore on, although his usually reliable finishing let him down.
Wayward on the ball early on, he grew into proceedings and gradually his athleticism and energy began to have an impact. Was unlucky to be denied by the crossbar in the build-up to Hazard's goal.
The most dangerous player on the pitch. His direct running, skill and awareness often caused panic in the Southampton defence, and his finish on the stroke of half-time was the epitome of calm and class.
One of the more frustrating nights for the talented Brazilian. His touch and passing deserted him for spells and, when they didn't, he couldn't find a killer final touch.
Constantly probing from a central position, this wasn't his most influential performance, although he still produced one or two thrilling moments of magic.
Links up with Chelsea's creators more formidably than Torres has all season, and some of his combination play with Hazard was sublime. When he got his chance on 25 minutes, you never doubted he'd take it.
Commanded his area reasonably well, and was helpless to prevent either Ba or Hazard finding the net.
Never looked comfortable dealing with Ba. His distribution out of defence was good, but it's the defensive fundamentals which look shaky.
Wasn't strong enough at the near post to prevent Azpilicueta's cross finding Ba for Chelsea's opener, and still struggles to convince at this level.
Tormented by Hazard defensively, he got his own back in the second half when he rode the Belgian's tame challenge to cross for Lambert's goal.
Quite a talent on this evidence. Kept his defensive discipline well to ensure Oscar had a quiet night, and his lung-bursting run and cross from the left enabled Puncheon to level the scores superbly.
Was out-passed by Chelsea's midfielders and replaced by Chaplow with just over 20 minutes left.
Unfussy and intelligent on the ball, and pressured Chelsea's midfielders when off it. A less spectacular figure in the Southampton comeback, but a key one.
Did ok against his former club, playing solidly in midfield, if a little too safely at times.
Occupied Azpilicueta with his skill, but his delivery was poor and he left Shaw a little too exposed defensively.
A threat all evening, rarely giving the ball away and helping his side build sustained periods of pressure. Defended his flank well, and couldn't have taken his goal any more emphatically.
Ploughed a lone furrow up front well in the first half, showcasing good touches and awareness to find his team-mates, but couldn't fashion a clear chance for himself.
Replaced Do Prado with just over 15 minutes left and instantly presented more of a threat.
Played the last 25 minutes with energy and discipline.
Brought on to get his side back into the game and did just that, powering a brilliant header past Cech to give Southampton hope.