Match ends, Millwall 2, Burton Albion 0.
Play-off hopefuls Millwall scored two goals in six first-half minutes to beat League One leaders Burton Albion and go fifth in the table.
Albion would have regained a four-point lead over second-placed Wigan Athletic with a victory but, despite a bright start, they trailed when Aiden O'Brien crashed the ball into the top corner.
Lee Gregory made it 2-0 when he scored after rounding keeper Jon McLaughlin.
Clear chances were scarce after the break and the Lions held on.
Burton Albion manager Nigel Clough told BBC Radio Derby: "I thought we started brilliantly in the first 10 minutes or so.
"We had two or three situations and a great chance to score, and then we just got caught out with two balls over the top.
"It's because we were attacking. If you're attacking it's very difficult for the back four to be on the edge of our own penalty area."
- 27RomeoBooked at 90mins
- 16BeeversBooked at 74mins
- 3MartinBooked at 85mins
- 24ThompsonBooked at 21mins
- 22O'BrienSubstituted forUpsonat 70'minutes
- 9GregorySubstituted forPhilpotat 88'minutes
- 20MorisonSubstituted forOnyedinmaat 90+5'minutes
- 4MousinhoBooked at 22mins
- 21DuffySubstituted forMyers-Harnessat 86'minutes
- 12ButcherBooked at 75mins
- 15NaylorSubstituted forWalkerat 45'minutes
- 9BeavonBooked at 42minsSubstituted forBennettat 63'minutes
- Keith Stroud
- Shots on Target
Second Half ends, Millwall 2, Burton Albion 0.
Substitution, Millwall. Fred Onyedinma replaces Steve Morison.
Chris Taylor (Millwall) wins a free kick on the left wing.
Foul by Mason Bennett (Burton Albion).
Foul by Steve Morison (Millwall).
Marcus Myers-Harness (Burton Albion) wins a free kick on the right wing.
Mahlon Romeo (Millwall) is shown the yellow card for a bad foul.
Foul by Mahlon Romeo (Millwall).
Lucas Akins (Burton Albion) wins a free kick on the left wing.
Foul by Jamie Philpot (Millwall).
Tom Flanagan (Burton Albion) wins a free kick on the right wing.
Substitution, Millwall. Jamie Philpot replaces Lee Gregory.
Corner, Burton Albion. Conceded by Mark Beevers.
Substitution, Burton Albion. Marcus Myers-Harness replaces Mark Duffy.
Joe Martin (Millwall) is shown the yellow card for a bad foul.
Foul by Joe Martin (Millwall).
Lucas Akins (Burton Albion) wins a free kick on the right wing.
Attempt saved. Ben Thompson (Millwall) right footed shot from the centre of the box is saved in the bottom left corner.
Foul by Shaun Williams (Millwall).