Walshaw competed in a freestyle double (both 100 and 200 m) at the 2000 Summer Olympics in Sydney. He posted FINA B-standards of 52.08 (100 m freestyle) and 1:52.75 (200 m freestyle) from the U.S. National Championships in Fort Lauderdale, Florida. In the 200 m freestyle, Walshaw placed fortieth on the morning prelims. Swimming in heat four, he rounded out the field to last place in a new Zimbabewan record of 1:54.70. Two days later, in the 100 m freestyle, Walshaw challenged seven other swimmers in the same heat, including Fiji's three-time Olympian Carl Probert. He raced to seventh place and fifty-second overall in 52.53, more than half a second off his entry time.