Postpublished at 23 mins
Sofiane Boufal has got some skills for Southampton, not no end product yet. A lot of nice touches but no killer pass so far.
Victor Moses wipes out Ryan Bertrand and it's a free-kick to the Saints.
Costa heads 50th Premier League goal and then fires in low
Romeu and Bertrand score against former club
Hazard buries from 15 yards, Cahill heads home
Terry makes first league appearance since November
Emlyn Begley
Sofiane Boufal has got some skills for Southampton, not no end product yet. A lot of nice touches but no killer pass so far.
Victor Moses wipes out Ryan Bertrand and it's a free-kick to the Saints.
Chelsea are tearing Southampton apart at the moment, Diego Costa touches the ball away from Jack Stephens but the ball just gets away from him under the guidance of Maya Yoshida.
The Blues are looking more like the side who were cruising to the Premier League title a month ago.
Text us on 81111
I meant to ask If a player goes into the pack off potting a red and the pack splits so he or she cannot possibly get out of the pack without hitting a red what is the rule? Rerack or frame away or foul points or something we didn't think of?
Snooker Loopy
I'm not really sure Snooker Loopy. This isn't really the forum for snooker chat. This is a football live text.
Oh wait, we must be sharing a phone number with the BBC's snooker coverage from the Crucible.
I thought there were a lot of you wondering about snooker frames during this game...
This is a chance for 2-0 to Chelsea as Diego Costa touches Cesc Fabregas' pass onto Eden Hazard but the Belgian's first-time effort from the edge of the box is too nonchalant and goes over the bar.
The exact same trio combining as for the goal.
The Saints are having a good spell of possession at the moment but they're not really doing much with it. Cesc Fabregas hoofs the ball out of play.
Any Southampton fans out there looking for a good omen?
The side scoring first hasn't won any of the last five Premier League meetings between these two at Stamford Bridge.
Victor Moses finds Diego Costa and his shot is deflected out for a corner by Southampton defender Jack Stephens.
The corner doesn't really come to anything though as N'Golo Kante chips the ball forward into the hands of Fraser Forster.
Chelsea are looking quite comfortable. The Blues' former Bolton left-back Marcos Alonso tries a cross from the left but it's cut out.
#bbcfootball
Richard reviews: Hazard is outrageous. Similar style as Messi's 500th. So many players around and yet none of them can do a thing
Bisa Amoo: How does no-one track that Hazard run? He crossed half the pitch to get that shot!
Sahil Oberoi: I guess Spurs & Southampton didn't watch the Herrera vs Hazard tape
Phil McNulty
BBC Sport chief football writer at Stamford Bridge
Chelsea manager Antonio Conte was literally jumping up and down in a fury after Southampton almost caught Chelsea's defence napping with a well-worked free-kick - then he was pumping his fists in elation seconds later after Eden Hazard gave his side the lead.
That's football.
That is Eden Hazard's 15 Premier League goal of the season, his best return in an English league campaign.
The start Chelsea would have dreamt of. Cesc Fabregas plays Diego Costa down the right and he pulls it back to Eden Hazard, who just sweeps it home with ease - the recalled duo linking up well.
Chelsea heading seven points clear as things stand.
Eden Hazard
PFA player of the year N'Golo Kante clips Sofiane Boufal from behind and gets a talking to from referee Lee Mason. No yellow card though.
Chelsea's defenders dawdle on the ball under pressure from Manolo Gabbiadini. They eventually get the ball back to Thibaut Courtois, but it was a moment of fright there at the back.
Early break for Chelsea as Eden Hazard finds Cesc Fabregas but his attempted through-ball is cut out.
Chelsea 0-0 Southampton
We are under way at Stamford Bridge.
The players are out on the pitch as we officially enter the 'games you didn't even know were on when you woke up this morning' section of the season.
#bonusfootball
There are also Premier League matches on tomorrow and Thursday. A crucial stage of the season for all fantasy football players...
Warning: Puel's opinion may differ to yours
Southampton midfielder Oriol Romeu is "not far off" PFA Player of the Year N'Golo Kante, according to Saints boss Claude Puel.
Uncapped Spaniard Romeu, 25, returns from a two-match ban to face his former club tonight.
"Kante brings the same qualities as Oriol for us because he's very consistent and in every game he gives good performances," said Puel.
"Without [Kante] for Chelsea it's difficult and the same with Romeu, it's difficult for us without him.
"I think he's not far off Kante, he's an important player for this team because he can do fantastic work to recover the ball and start the play."
The stats are good for the Saints to at least score today.
Chelsea have gone 10 Premier League games without keeping a clean sheet for the first time since a run of 13 matches in December 1996.
Southampton have won three of their last four Premier League away games, scoring 10 goals.