Sia Wai Yen

At the 2002 Asian Games in Busan, South Korea, Sia finished seventh in the 400 m individual medley at 5:06.20, holding off a sprint freestyle race from Hong Kong's Chan Wing Suet by four-hundredths of a second (0.04).

When her nation hosted the 2001 Southeast Asian Games in Kuala Lumpur, Sia enjoyed the race of her life in the pool, as she completed a full set of medals in front of a raucous home crowd: gold in the 400 m individual medley (4:55.87), and two bronze each in the 400 m freestyle (4:24.87) and 200 m individual medley (2:22.44).

Sia competed in a medley double at the 2000 Summer Olympics in Sydney. She achieved FINA B-standards of 2:20.64 (200 m individual medley) and 4:52.52 (400 m individual medley) from the Southeast Asian Games in Bandar Seri Begawan, Brunei. On the first day of the Games, Sia placed twenty-fifth in the 400 m individual medley. Swimming in heat four, she raced to the bottom of the pack in a poor time of 4:59.18, more than six seconds farther from her national record. Two days later, in the 200 m individual medley, Sia posted a time of 2:20.64 to round out the field in heat two, but finished in thirty-first place among 36 other swimmers from the prelims.

Sia Wai Yen (born 15 January 1984) is a Malaysian former swimmer, who specialised in long-distance freestyle and individual medley events. She represented Malaysia, as a 16-year-old teen, at the 2000 Summer Olympics, captured a total of four medals in two editions of the Southeast Asian Games (1999 and 2001), and later became a top 8 finalist at the 2002 Asian Games.