Millwall suffered a first defeat in 18 games last night.

Top-two-chasing Fulham scored three second-half goals to leave Millwall’s play-off hopes up in the air.

Here are five things we learned...

The unbeaten run is over

It lasted 109 days, but Millwall’s unlikely unbeaten run was ended as Fulham became the first team this season to complete the double over Neil Harris’ side.

The Lions had chances to get themselves in front during a dominant first-half but failed to convert and paid a heavy price as the Cottagers turned on the style in the second period to take home the points.

Jordan Archer’s long-range woes continue

Last week the Scot was the hero, this time around he was far from it. Archer was unable to hold onto Aleksander Mitrovic’s tame long-range effort, spilling it straight into the path of Ryan Sessegnon, who was first on the scene to sweep it home and put Fulham ahead.

Just ten minutes later, he was at fault again for Fulham’s second. Kevin McDonald let fly from 25 yards and he went with the wrong hand, letting the ball slip past him.

Play-offs are still a possibility

Despite the defeat Millwall still sit in the top six but have played a game more than all their play-off rivals and two more than Derby, who host Middlesbrough today.

The Lions need to hope that Boro fail to beat Derby, then a win at the Riverside next Saturday evening would keep it in their own hands ahead of final day clash with Aston Villa on 6 May.

A game of two halves

The famous phrase was no more apparent on Friday night as Millwall did anything apart from score in a dominant first-half display at the Den.

From the moment Jake Cooper crashed the bar, via a Marcus Bettenelli fingertip save in the opening four minutes, you could tell it was going to be ‘one of those nights’.

Jed Wallace had an effort cleared off the line by Tim Ream with the goal gaping, when he really should have scored and when the Lions finally did beat Bettenelli in the Fulham goal, they were denied by the officials.

The Den was rocking

From the moment the players emerged from the tunnel, there was an array of noise around South Bermondsey.

Despite the visitors scoring three times in the second-half, that didn’t stop the Lions fans, who gave their players a standing ovation as they left the pitch at full-time.

The 17,614 fans inside the Den, was the biggest league crowd since December 2012.