Andrew Mullen is aiming to narrow the gap on Brazil's Daniel Dias after taking his second silver at the IPC Swimming World Championships.
"It is a reasonably new event for me," Mullen told BBC Scotland.
"I only started swimming it last year, so I'm pleased my times are coming down and I'm pretty competitive."
Mullen produced a new personal best as he secured his silver medal.
"I can't really complain," he said. "I'm really pleased with that.
"I've done a lot of freestyle work this season so to see it pay off is nice. I hope at some point in my career I'll be a threat to Daniel.
"I'm not sure when it will be, but I'm just striving to get my times faster and more competitive, so we'll see what happens."