|LV County Championship Division One, New Road|
|Close, day two: Durham 587-7 dec v Worcestershire 105-5|
|Durham 6pts, Worcs 2pt|
Phil Mustard scored Durham's third century of the innings as the visitors ended day two 482 runs ahead of Worcestershire at New Road.
Mustard made 101, while Gordon Muchall (175) and Ian Blackwell (134) added only five to their overnight partnership to take it to 247.
Scott Borthwick added an unbeaten 67 as Durham declared on 587-7.
The hosts slumped to 105-5 in reply, with Steve Harmison taking 3-29 and Moeen Ali top scoring with 46.
Worcestershire, who have lost all five of their Championship matches this season, still need another 333 runs to avoid the follow-on.
Harmison, who missed the start of the season with a broken arm, soon had the home side in trouble taking two wickets in successive overs.
Matt Pardoe had made 11 when he became Harmison's first Championship wicket for nine months, and an over later the former England man got rid of James Cameron for 18.
Ruel Brathwaite found some movement to bowl Vikram Solanki for 10, while Ben Stokes accounted for Alexei Kervezee who had just a single to his name.
Harmison rejoined the attack to pick up his third wicket, as Moeen was caught down the leg side by Mustard for 46.
Earlier, Muchall and Blackwell's 247-run record fifth-wicket record partnership for the county was ended when Damien Wright (2-118) flattened the latter's off-stump in the second over of the day.
Muchall added 23 to his overnight score before being caught at slip by Solanki off Richard Jones.
Mustard was already well set by then, and had made 101 from 139 balls when he became Moeen's only wicket in 24 expensive overs.
Borthwick's 67 was one shy of his career best, while Callum Thorp hit two sixes in his 22 off 12 balls prior to the declaration.
CLOSE OF PLAY SUMMARY
BBC Hereford & Worcester's Dave Bradley:
"Durham's formidable total is way out of Worcestershire's reach. Once again the back-up bowlers did not match the efforts of Wright and Richardson, but take nothing away from Mustard who batted well on a pitch that has something in it.
"Harmison still looks the part, not as quick as he once was but good enough to rip through Worcestershire's inexperienced top order.
"Worcestershire are struggling at the top level, one can only hope they are learning from their mistakes but even the most ardent fans must realise it is going to be a long summer.
"One only hopes they will have patience and not call for heads to roll as so often happens when a team struggles."