Two more bouts have been added to the nearly complete UFC fight Night 28 (formerly UFC on Fox Sports 1 #3) fight card. Welterweights Kenny Robertson will face Joao Zeferino while lightweight Francisco Trinaldo takes on UFC newcomer Piotr Hallmann on the Sept. 4 event. Robertson (12-3 MMA, 1-3 UFC) lost his first two UFC bouts to Mike Pierce and Aaron Simpson before logging his lone UFC victory against Brock Jardine at UFC 157 .  He is coming off a loss in his last outing to Sean Pierson and is in desperate need of a win. Zeferino (13-5 MMA, 0-1 UFC) will try to get his first UFC win when he faces Robertson.  He made his promotional debut on May 18, losing a unanimous decision to Rafael Natal. Trinaldo (13-2 MMA, 3-1 UFC) is on a two-fight winning streak with victories over C.J.