Brown edged out Conan Whitehead and hit an astonishing eight 180’s en route to claiming the victory.
‘The Needle’ won 6-4 and averaged 96.5 as he continues his impressive form as of late.
Koltsov has also been impressive but he had to hold his nerve to see off Johan Engstrom hitting a 13 darter in the decider to claim the win.
Lennon on the other hand came through in a rout against Jamie Bain in which he won 6-1 against the Scotsman.
The Carlow ace hasn’t been in the best form as of late and so will use this win as a huge confidence boost.
Click here to check out the PDC European Tour 2019 tournament centre. Conan Whitehead (89.86) 4-6 (96.59) Keegan Brown
Boris Koltsov (91.37) 6-5 (80.68) Johan Engstrøm
Jamie Bain (79.17) 1-6 (88.53) Steve Lennon
Dietmar Burger v Tytus Kanik
Stephen Bunting v Patrick van den Boogaard
Ross Smith v John Henderson
Darius Labanauskas v Michael Rasztovits
Mark Webster v Dirk van Duijvenbode