Dundee made one change to the starting line up who faced Forfar Athletic last week. Ben Williamson replaced Paul McGowan. On the bench there was places for Lee Ashcroft and new signing Zach Robinson.
Dundee started well and had a lot of the ball but failed to create anything clear cut. Niall McGinn had a shot that hit the side netting.
Partick looked dangerous on the break. They opened the scoring on 16 minutes Dundee gave the ball away in midfield and Thistle played a quick one two for Fitzspartick to score from 20 yards. Dundee attacked next and Mulligan had a shot well saved by the Jags keeper.
But it was 2-0 soon after when mistakes in the Dundee defence led for Brannigan to score. the ball should have been cleared first time.
Second half was only 5 minutes old when it was 3-0 slack defensive play let the unmarked Lawless to head home to the delight of the away fans.
But on 64 minutes Dundee scored from a corner when Cammy Kerr headed home. At least it give us some hope for the last 26 minutes. Josh Mulligan then had a great chance but put his shot over the bar it really should have been on target.
Ryan Sweeney hit the post with a header so unlucky not to score. Dundee battled away and scored again with 6 minutes left, Tyler French headed home from a McMullen corner.
Dundee kept at it but failed to score again they did have a few half chances but the ball would not fall.
Partick deserved the three points Dundee need to sort out the errors which cost them today.
Dundee: Sharp, Kerr, Sweeney (c), French, Marshall, Byrne (Robertson 75), Anderson (Robinson 75)
Mulligan, Williamson (McMullan 26), McGinn (Rudden at half time), Jakubiak. Unused Subs: Lawlor (gk), Ashcroft, McCowan, Cameron, Fisher.
Referee: Alan Muir
Att: 5,513