Summer McIntosh, 15, sets jr. record in women's 200m butterfly at aquatics worlds

Toronto swimmer Summer McIntosh will enter the women's 200-metre butterfly final at the 19th FINA world aquatics championships as junior record holder.

The 15-year-old accomplished the feat Tuesday, winning the second of two semifinals in two minutes 5.79 seconds and qualifying first overall for Wednesday's 12:02 p.m. ET final in Budapest, Hungary.

Suzuka Hasegawa held the previous mark of 2:06.29 since April 15, 2017 at the Japanese championships in Nagoya.

McIntosh defeated American Regan Smith (2:07.13) who was fresh off qualifying for the 50 backstroke final at Duna Arena. Hungary's Boglarka Kapas, the defending world champion in the 200 free, was third in 2:07.89.

"Summer is a once-in-a-generation swimmer," longtime CBC Sports swimming analyst Byron MacDonald said in April. "You don't see this very often and they're very special. And she's going to get better and better and better."

WATCH | McIntosh wins world 200m butterfly semifinal in junior record time:

Smith trailed McIntosh by 17-100ths of a second after 50 metres and 56-100ths midway through the race. Competing in a new event at her debut worlds, the Canadian was quick through 100 and extended her lead by 71-100ths at the 150-metre mark, got clear of Smith in the last 50 minutes and held off the reigning Olympic silver medallist for the win.

On Saturday, McIntosh won a silver medal in the 400 free and will also race the 400 individual medley in Budapest.

WATCH | 15-year-old McIntosh swims to world championship silver:

Last summer, a 14-year-old McIntosh was the youngest member of the Canadian Olympic team in Tokyo but certainly didn't show her age on the world's grandest athletic stage.

She placed fourth in the 400 free, at that point lowering the Canadian