OXFORD United made it two wins in a row with an ultimately comfortable victory at Underhill, despite a late red card for captain Jake Wright.
First-half strikes from Simon Heslop and Liam Davis proved the difference, with Alfie Potter involved in almost all of Oxford's best moments.
Barnet managed plenty of pressure in the first half and had a goal ruled out for handball on 20 minutes after Daniel Leach's shot was deflected in.
Referee Carl Berry ruled it had come off a Barnet had and the U's survived.
They made the Bees pay on 33 minutes when Heslop curled home a fine shot from 20 yards.
Five minutes later, Davis volleyed a second after a great 1-2 with Peter Leven.
Barnet's Dean Brill and Oxford's Ryan Clarke both made good saves after the break, with James Constable and Dean Smalley going close for the U's Late on, Barnet skipper Mark Hughes hooked a volley against a post, but it was not his side's day.
Wright was booked for a first-half foul on Izale McLeod and received a second yellow in stoppage time after bringing down substitute and former United man Sam Deering.
Barnet (4-3-1-2): Brill; Senda (Owusu 69), Leach, Kamdjo, Parkes; Holmes, Hughes, Marshall (Deering 46); Byrne; Taylor (Kabba 46), McLeod.
Oxford (4-3-3): Clarke; Batt, Duberry, Wright, Davis; Heslop (Haworth 61), McLaren (Whing 73), Leven; Potter, Constable (Smalley 78), R Hall.
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