SEATTLE – It’s hard to get UFC welterweight Robbie Lawler to express much interest or emotion about anything, even when it comes to fighting. He won’t even brag about a recent TKO victory over Josh Koscheck , which followed a 2-4 skid and marked Lawler’s first UFC victory since 2004. But after some further thought, he finally perked up. “It was big for everyone else, but I knew what I could do,” he said of the “Knockout of the Night” performance at UFC 157. “But I guess it’s nice that everyone else kind of knows what I’m capable of. Maybe it put a little fear in some opponents. But I’m not too worried about that. Just fulfilling my dreams and fighting to the best of my ability is what I want to do, and that’s what I’m trying to do.” Lawler (20-9 MMA, 5-3 UFC) continues that quest on Saturday in a UFC on FOX 8 main-card bout at Seattle’s KeyArena, where he meets Bobby Voelker (24-9 MMA, 0-1 UFC), a late replacement for Siyar Bahadurzada (21-5-1 MMA, 1-1 UFC), himself a replacement for Tarec Saffiedine (14-3 MMA, 0-0 UFC).