Powerless to stop Rodriguez giving Southampton the lead 13 seconds in, and was otherwise solid.
Once again acquitted himself well at left-back, though his natural right-footedness means he cannot provide much of an attacking outlet from that position.
Marshalled the defence well and could do nothing to prevent Essien's mistake being punished. Scored a superb header on his 400th Premier League appearance.
Kept Rodriguez under lock and key whenever he stuck to the left flank - which, admittedly, was not often. Once again offered little in the way of quality going forward though.
Slow to react to Essien's suicidal pass for the Rodriguez goal, but looked relatively assured after that. Did very well to direct Ba's rebound into the net for the equaliser.
Was integral to Chelsea's ability to compete with Southampton's high-intensity midfield pressing, though he once again exhibited his worrying tendency to commit silly fouls in dangerous areas. Upped his game in the second half and ran all over Southampton.
Endured a poor first half, with his passing and set-piece delivery particularly wayward. He never wilted from the challenge though and improved hugely after the break - both goals came from his corners.
His close control was, as ever, sublime and he constantly worried the Southampton defence without being at his most decisive.
Once again looked jaded before an ankle injury brought a premature end to his afternoon.
A bundle of energy up front, pressuring the Southampton defence into mistakes and playing a key role in the waves of pressure which led to Chelsea's goals.
Avoided the kind of howler which marred his performance against Arsenal and made one stunning save to deny Torres, but a hand injury brought his game to an end after 58 minutes.
Delivered another performance which will surely impress his boyhood club. Strong defensively and showed fantastic energy up and down the left flank all game. With Cole getting no younger, Chelsea should move heaven and earth to sign him.
Made countless excellent interceptions, headers and tackles only for his team to be undone from set-pieces.
Got forward well early on but found himself pinned back by Hazard for the rest of the game.
Stood up to Chelsea's aerial barrage very well, though Ba's introduction gave him big problems.
Neat and tidy on the ball but failed to make any real impact on this game.
As assured and intelligent in midfield as ever, but was taken off on 67 minutes with his team chasing the game.
His crossing technique is a joy to watch and caused Chelsea all sorts of problems. Replaced by Davis on 63 minutes.
A far more effective physical presence than Essien and his passing is better than many give him credit for.
Switched on from the first second and got his reward, stroking home a goal which was easy only because of his superb anticipation. Pretty well shackled by Ivanovic thereafter though.
The decision to start him ahead of Lambert was a surprise, and the gamble did not pay off as he was only ever on the periphery.
Brought on in place of Ramires to help his team gain a foothold in midfield and did just that. Swung in a couple of dangerous free-kicks too.
His movement, physicality and application made him an absolute nightmare for the Southampton defence. Deserved his goal and his introduction changed the game.
Unexpectedly called into action when Boruc was injured on the hour and fared reasonably well. Could do nothing about Terry's header and was surprised by Ba's sliding finish.
Replaced Ward-Prowse but was unable to offer anything more than fresh legs.
Had dangerous moments when he came on, but the tide of the game had already turned. Perhaps Pochettino will regret not starting him.