In the first 2 rounds, Brendan wins a total of 2 rounds * 6 matches per round = <<2*6=12>>12 matches.
In the last round, Brendan wins half of the matches which is 4 matches / 2 = <<4/2=2>>2 matches.
Throughout the competition, Brendan has therefore won 12 + 2 = <<12+2=14>>14 matches.
#### 14